for loop

[Nuha]

 #include<stdio.h>
int main(void )
{
for (int b=0;b<=5;b++)
for (int a=0;a<=b;a++) 
printf("*\n"); 
}

^^^^
I dont know why this code executes 21 "*" line by line
I mean why it prints 21 particular ?



thank you

[laserlight]

Because:

#include<stdio.h>

int main(void)
{
    for (int b = 0; b <= 5; b++)
        for (int a = 0; a <= b; a++)
            printf("b=%d, a=%d\n", b, a);
}

In other words, trace the flow of control, watch the variables (e.g., using a debugger), and it will soon become clear to you.

[Nuha]

Thank you so much I got it