Impara How to Work with Nested While Loops in C

Nested loops allow you to perform more complex iteration patterns in your C programs. When you nest while loops, you place one while loop inside another. The outer loop controls the number of times the inner loop runs, and the inner loop completes all its iterations for each single iteration of the outer loop. This technique is especially useful when you need to work with two-dimensional data or when you want to create patterns, such as printing shapes made of characters.

triangle_while.c


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#include <stdio.h>

int main() {
    int rows = 5;
    int i = 1;
    
    while (i <= rows) {
        int j = 1;
        while (j <= i) {
            printf("*");
            j++;
        }
        printf("\n");
        i++;
    }
    return 0;
}

When using nested while loops, the flow of execution starts with the outer loop. For each iteration of the outer loop, the inner loop runs from its starting condition until its ending condition is met. After the inner loop completes, control returns to the outer loop, which then proceeds to its next iteration. This means that the inner loop executes completely for each single cycle of the outer loop, allowing you to build up complex output or process data in multiple dimensions.

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Sezione 3. Capitolo 2

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triangle_while.c


              1234567891011121314151617
            
#include <stdio.h>

int main() {
    int rows = 5;
    int i = 1;
    
    while (i <= rows) {
        int j = 1;
        while (j <= i) {
            printf("*");
            j++;
        }
        printf("\n");
        i++;
    }
    return 0;
}

Tutto è chiaro?

Grazie per i tuoi commenti!

Sezione 3. Capitolo 2