Happy About the progress

src1/agree0.c

@@ -0,0 +1,20 @@
+// Comparing against lowercase char
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user to agree
+    char c = get_char("Do you agree? ");
+
+    // Check whether agreed
+    if (c == 'y')
+    {
+        printf("Agreed.\n");
+    }
+    else if (c == 'n')
+    {
+        printf("Not agreed.\n");
+    }
+}

src1/agree1.c

@@ -0,0 +1,24 @@
+// Comparing against lowercase and uppercase char
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user to agree
+    char c = get_char("Do you agree? ");
+
+    // Check whether agreed
+    if (c == 'y')
+    {
+        printf("Agreed.\n");
+    }
+    else if (c == 'Y')
+    {
+        printf("Agreed.\n");
+    }
+    else
+    {
+        printf("Not agreed.\n");
+    }
+}

src1/agree2.c

@@ -0,0 +1,20 @@
+// Logical operators
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user to agree
+    char c = get_char("Do you agree? ");
+
+    // Check whether agreed
+    if (c == 'Y' || c == 'y')
+    {
+        printf("Agreed.\n");
+    }
+    else
+    {
+        printf("Not agreed.\n");
+    }
+}

src1/calculator0.c

@@ -0,0 +1,19 @@
+// Addition with int
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for x
+    int x = get_int("What's x? ");
+
+    // Prompt user for y
+    int y = get_int("What's y? ");
+
+    // Add numbers
+    int z = x + y;
+
+    // Perform addition
+    printf("%i\n", z);
+}

src1/calculator1.c

@@ -0,0 +1,16 @@
+// Addition with int, without third variable
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for x
+    int x = get_int("What's x? ");
+
+    // Prompt user for y
+    int y = get_int("What's y? ");
+
+    // Perform addition
+    printf("%i\n", x + y);
+}

src1/calculator2.c

@@ -0,0 +1,13 @@
+// Doubles a number
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for x
+    int x = get_int("What's x? ");
+
+    // Double it
+    printf("%i\n", x * 2);
+}

src1/calculator3.c

@@ -0,0 +1,22 @@
+// Overflow 
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int dollars = 1;
+    while (true)
+    {
+        char c = get_char("Here's $%i. Double it and give to next person? ", dollars);
+        if (c == 'y')
+        {
+            dollars *= 2;
+        }
+        else
+        {
+            break;
+        }
+    }
+    printf("Here's $%i.\n", dollars);
+}

src1/calculator4.c

@@ -0,0 +1,22 @@
+// long
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    long dollars = 1;
+    while (true)
+    {
+        char c = get_char("Here's $%li. Double it and give to next person? ", dollars);
+        if (c == 'y')
+        {
+            dollars *= 2;
+        }
+        else
+        {
+            break;
+        }
+    }
+    printf("Here's $%li.\n", dollars);
+}

src1/calculator5.c

@@ -0,0 +1,16 @@
+// Division with ints, demonstrating truncation
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for x
+    int x = get_int("What's x? ");
+
+    // Prompt user for y
+    int y = get_int("What's y? ");
+
+    // Divide x by y
+    printf("%i\n", x / y);
+}

src1/calculator6.c

@@ -0,0 +1,16 @@
+// Casting
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for x
+    int x = get_int("What's x? ");
+
+    // Prompt user for y
+    int y = get_int("What's y? ");
+
+    // Divide x by y
+    printf("%f\n", (float) x / y);
+}

src1/calculator7.c

@@ -0,0 +1,16 @@
+// Floats
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for x
+    float x = get_float("What's x? ");
+
+    // Prompt user for y
+    float y = get_float("What's y? ");
+
+    // Divide x by y
+    printf("%.50f\n", x / y);
+}

src1/cat0.c

@@ -0,0 +1,10 @@
+// Opportunity for better design
+
+#include <stdio.h>
+
+int main(void)
+{
+    printf("meow\n");
+    printf("meow\n");
+    printf("meow\n");
+}

src1/cat1.c

@@ -0,0 +1,13 @@
+// Better design
+
+#include <stdio.h>
+
+int main(void)
+{
+    int i = 3;
+    while (i > 0)
+    {
+        printf("meow\n");
+        i--;
+    }
+}

src1/cat10.c

@@ -0,0 +1,19 @@
+// Uses a do-while loop instead.
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int n;
+    do
+    {
+        n = get_int("What's n? ");
+    }
+    while (n < 0);
+
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat11.c

@@ -0,0 +1,19 @@
+// Abstraction
+
+#include <stdio.h>
+
+void meow(void);
+
+int main(void)
+{
+    for (int i = 0; i < 3; i++)
+    {
+        meow();
+    }
+}
+
+// Meow once
+void meow(void)
+{
+    printf("meow\n");
+}

src1/cat12.c

@@ -0,0 +1,19 @@
+// Abstraction with parameterization
+
+#include <stdio.h>
+
+void meow(int n);
+
+int main(void)
+{
+    meow(3);
+}
+
+// Meow some number of times
+void meow(int n)
+{
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat13.c

@@ -0,0 +1,20 @@
+// Demonstrates scope
+
+#include <stdio.h>
+
+void meow(int n);
+
+int main(void)
+{
+    int n = 3;
+    meow(n);
+}
+
+// Meow some number of times
+void meow(int n)
+{
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat14.c

@@ -0,0 +1,26 @@
+// User input
+
+#include <cs50.h>
+#include <stdio.h>
+
+void meow(int n);
+
+int main(void)
+{
+    int n;
+    do
+    {
+        n = get_int("Number: ");
+    }
+    while (n < 1);
+    meow(n);
+}
+
+// Meow some number of times
+void meow(int n)
+{
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat15.c

@@ -0,0 +1,34 @@
+// Return value
+
+#include <cs50.h>
+#include <stdio.h>
+
+int get_positive_int(void);
+void meow(int n);
+
+int main(void)
+{
+    int n = get_positive_int();
+    meow(n);
+}
+
+// Get number of meows
+int get_positive_int(void)
+{
+    int n;
+    do
+    {
+        n = get_int("Number: ");
+    }
+    while (n < 1);
+    return n;
+}
+
+// Meow some number of times
+void meow(int n)
+{
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat2.c

@@ -0,0 +1,13 @@
+// Print values of i
+
+#include <stdio.h>
+
+int main(void)
+{
+    int i = 1;
+    while (i <= 3)
+    {
+        printf("meow\n");
+        i++;
+    }
+}

src1/cat3.c

@@ -0,0 +1,13 @@
+// Better design
+
+#include <stdio.h>
+
+int main(void)
+{
+    int i = 0;
+    while (i < 3)
+    {
+        printf("meow\n");
+        i++;
+    }
+}

src1/cat4.c

@@ -0,0 +1,11 @@
+// Better design
+
+#include <stdio.h>
+
+int main(void)
+{
+    for (int i = 0; i < 3; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat5.c

@@ -0,0 +1,12 @@
+// Infinite loop
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    while (true)
+    {
+        printf("meow\n");
+    }
+}

src1/cat6.c

@@ -0,0 +1,14 @@
+// Prompts user for n.
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int n = get_int("What's n? ");
+
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat7.c

@@ -0,0 +1,18 @@
+// Prompts user again if need be. (Poor design.)
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int n = get_int("What's n? ");
+    if (n < 0)
+    {
+        n = get_int("What's n? ");
+    }
+
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat8.c

@@ -0,0 +1,26 @@
+// Uses a loop with continue/break.
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int n;
+    while (true)
+    {
+        n = get_int("What's n? ");
+        if (n < 0)
+        {
+            continue;
+        }
+        else
+        {
+            break;
+        }
+    }
+
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/cat9.c

@@ -0,0 +1,22 @@
+// Uses a loop with just break.
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    int n;
+    while (true)
+    {
+        n = get_int("What's n? ");
+        if (n >= 0)
+        {
+            break;
+        }
+    }
+
+    for (int i = 0; i < n; i++)
+    {
+        printf("meow\n");
+    }
+}

src1/compare0.c

@@ -0,0 +1,17 @@
+// Conditional, Boolean expression, relational operator
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for integers
+    int x = get_int("What's x? ");
+    int y = get_int("What's y? ");
+
+    // Compare integers
+    if (x < y)
+    {
+        printf("x is less than y\n");
+    }
+}

src1/compare1.c

@@ -0,0 +1,21 @@
+// Conditionals that are mutually exclusive
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for integers
+    int x = get_int("What's x? ");
+    int y = get_int("What's y? ");
+
+    // Compare integers
+    if (x < y)
+    {
+        printf("x is less than y\n");
+    }
+    else
+    {
+        printf("x is not less than y\n");
+    }
+}

src1/compare2.c

@@ -0,0 +1,25 @@
+// Conditionals that aren't mutually exclusive
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for integers
+    int x = get_int("What's x? ");
+    int y = get_int("What's y? ");
+
+    // Compare integers
+    if (x < y)
+    {
+        printf("x is less than y\n");
+    }
+    if (x > y)
+    {
+        printf("x is greater than y\n");
+    }
+    if (x == y)
+    {
+        printf("x is equal to y\n");
+    }
+}

src1/compare3.c

@@ -0,0 +1,25 @@
+// Conditional that isn't necessary
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for integers
+    int x = get_int("What's x? ");
+    int y = get_int("What's y? ");
+
+    // Compare integers
+    if (x < y)
+    {
+        printf("x is less than y\n");
+    }
+    else if (x > y)
+    {
+        printf("x is greater than y\n");
+    }
+    else if (x == y)
+    {
+        printf("x is equal to y\n");
+    }
+}

src1/compare4.c

@@ -0,0 +1,25 @@
+// Conditionals
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    // Prompt user for integers
+    int x = get_int("What's x? ");
+    int y = get_int("What's y? ");
+
+    // Compare integers
+    if (x < y)
+    {
+        printf("x is less than y\n");
+    }
+    else if (x > y)
+    {
+        printf("x is greater than y\n");
+    }
+    else
+    {
+        printf("x is equal to y\n");
+    }
+}

src1/hello0.c

@@ -0,0 +1,8 @@
+// A program that says hello to the world
+
+#include <stdio.h>
+
+int main(void)
+{
+    printf("hello, world\n");
+}

src1/hello1.c

@@ -0,0 +1,10 @@
+// get_string and printf with incorrect placeholder
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string answer = get_string("What's your name? ");
+    printf("hello, answer\n");
+}

src1/hello2.c

@@ -0,0 +1,10 @@
+// get_string and printf with %s
+
+#include <cs50.h>
+#include <stdio.h>
+
+int main(void)
+{
+    string answer = get_string("What's your name? ");
+    printf("hello, %s\n", answer);
+}

src1/mario0.c

@@ -0,0 +1,8 @@
+// Prints a row of 4 question marks
+
+#include <stdio.h>
+
+int main(void)
+{
+    printf("????\n");
+}

src1/mario1.c

@@ -0,0 +1,12 @@
+// Prints a row of 4 question marks with a loop
+
+#include <stdio.h>
+
+int main(void)
+{
+    for (int i = 0; i < 4; i++)
+    {
+        printf("?");
+    }
+    printf("\n");
+}

src1/mario2.c

@@ -0,0 +1,11 @@
+// Prints a column of 3 bricks with a loop
+
+#include <stdio.h>
+
+int main(void)
+{
+    for (int i = 0; i < 3; i++)
+    {
+        printf("#\n");
+    }
+}

src1/mario3.c

@@ -0,0 +1,15 @@
+// Prints a 3-by-3 grid of bricks with nested loops
+
+#include <stdio.h>
+
+int main(void)
+{
+    for (int i = 0; i < 3; i++)
+    {
+        for (int j = 0; j < 3; j++)
+        {
+            printf("#");
+        }
+        printf("\n");
+    }
+}

src1/mario4.c

@@ -0,0 +1,16 @@
+// Prints a 3-by-3 grid of bricks with nested loops using a constant
+
+#include <stdio.h>
+
+int main(void)
+{
+    const int n = 3;
+    for (int i = 0; i < n; i++)
+    {
+        for (int j = 0; j < n; j++)
+        {
+            printf("#");
+        }
+        printf("\n");
+    }
+}

src1/mario5.c

@@ -0,0 +1,23 @@
+// Helper function
+
+#include <stdio.h>
+
+void print_row(int width);
+ 
+int main(void)
+{
+    const int n = 3;
+    for (int i = 0; i < n; i++)
+    {
+        print_row(n);
+    }
+}
+
+void print_row(int width)
+{
+    for (int i = 0; i < width; i++)
+    {
+        printf("#");
+    }
+    printf("\n");
+}