5. Control Structures

Branching with if/else and switch, looping with while, do-while, and for in C.

Branch with if/else and switch, loop with while, do-while, and for.

Examples

Guess the Number (guess_number.c)

Demonstrates if, else if, and else branching:

#include <stdio.h>

int main(void) {
    const int secret = 7;
    int guess;

    printf("Guess the number (between 1 and 10): ");
    scanf("%d", &guess);

    if (guess == secret) {
        printf("Correct!\n");
    } else if (guess < secret) {
        printf("Too small!\n");
    } else {
        printf("Too big!\n");
    }

    return 0;
}

Multiplication Table (multiplication_table.c)

Demonstrates the for loop to iterate a fixed number of times:

#include <stdio.h>

int main(void) {
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);

    for (int i = 1; i <= 10; i++) {
        printf("%d x %d = %d\n", n, i, n * i);
    }
    return 0;
}