#include<stdio.h> int main(){ int i; for(i=10;i++;i<15) printf("%d\n",i); }

Question

why does this runs as an infinite loop

Answer 1

because you don't use the for arguments as needed:

for (init; condition; inc)

so in your case:

for (i=10; i<15; ++i)

Answer 2

I very well know the format of a for loop. But what I am curious about is that why I am getting an infinite output

Answer 3

as i start with 10, and the 'for' condition is 'i++', it will be ever true: that's why you'll get an infinite loop...