Nested for loop in C programming language

In this tutorial, we will learn about Nested for loop in C programming language

Already, we discussed for loop in an earlier blog post.

In the C programming language, for loop inside another for loop is known as nested for loop. Nested for loop can contain more than one for loop(two or more).

Nested for loop in C programming language — Nested for loop in C language

Declaration

The syntax of the for loop

for(initialization; test_expression;increment or decrement  //outer loop          
{
           //statement(s) inside the body          
for(initialization; test_expression;increment or decrement  //inner loop
{
     //statement(s) inside the body
}   //End of inner for loop
}   //End of outer for loop

Structure of nested for loop

Nested for loop flow diagram

Initially, Nested for loop evaluates outer for loop test expression and evaluates only once. If the condition is true, the flow of control jumps to the inner for loop.

Then, the loop evaluates the condition of the inner loop. when the condition is true, it executes codes of inside the inner for loop. If the test expression returns false, the flow of control skips the execution and jumps out to the outer loop for execution.

Then the outer for loop test expression is evaluated again when the test expression is false, the flow of control skips the execution and come out of the loop for rest.

Program 1

#include 
#include 

int main()
{
    int i,j;
    for(i=0; i<=2; i++){
    printf("Statement of outer for loop\n");
       for(j=0; j<=3; j++){
            printf("%d %d :",i,j);
    printf("Statement of inner for loop\n");

}
    }
return 0;
}

When the above code is compiled and executed, it produces the following result.

Statement of outer for loop
0  0 :Statement of inner for loop
0  1 :Statement of inner for loop
0  2 :Statement of inner for loop
0  3 :Statement of inner for loop
Statement of outer for loop
1  0 :Statement of inner for loop
1  1 :Statement of inner for loop
1  2 :Statement of inner for loop
1  3 :Statement of inner for loop
Statement of outer for loop
2  0 :Statement of inner for loop
2  1 :Statement of inner for loop
2  2 :Statement of inner for loop
2  3 :Statement of inner for loop

Example

Program 2

#include 
#include 

int main()
{
    int a,b;
    for(a=1; a<=10; a++){
       for(b=1; b<=10; b++){
            printf("%d",b);
}
printf("\n");
    }
    getch();
return 0;
}

When the above code compiled and executed, it produced the following result

12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910
12345678910

The above program displays a rectangular number pattern using nested for loop in C

Program 2

#include 
#include 

int main()
{
    int a,b;
    for(a=1; a<=10; a++){
       for(b=1; b<=10; b++){
            printf("%c",'*');
}
printf("\n");
    }
    getch();
return 0;
}

When the above code is compiled and executed, it produces the following result

**********
**********
**********
**********
**********
**********
**********
**********
**********
**********

The above program displays rectangular star pattern using nested for loop in C

Nested for loop is used to display elements of the array, click here to learn more

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