Access for-loop index variable from attached for-loop

user_8588453 0
Viewed 42

I have this code:

for (int i = 0; i < var; i++)
  for (int j = 0; j < var2; j++)
    // something which using j variable

Can I use i variable from first loop instead var2 variable?

for-loop c variables
2 Answers

a quick note: if your code used brackets{} then the scope of the variables lives within the brackets boundaries. Wihtout the brackets in c your loop lives until the next semi colon (in other words one line of code)

for (int i = 0; i < var; i++) {
   // i can use i here but not j
   for (int j = 0; j < i; i++) {
   // something which using j variable
   // something using i variable
   }
   // i can use i here but not j
}

to learn more look up Scope in C https://www.tutorialspoint.com/cprogramming/c_scope_rules.htm#:~:text=A%20scope%20in%20any%20programming,which%20is%20called%20local%20variables.

user_94078090

The following code will be an infinite loop until limit reached (the value i will keep increasing, if you have replaced var2 with i )

#include <stdio.h>

int main()
{
    int var=10;
    for (int i = 0; i < var; i++)
  for (int j = 0; j < i; i++)
    {
     printf("test %d", i );    
    
    }
    
}
user_118549860
Related