for (size_t i = 0; i < 5; ++i) {
printf(
"element %zu is %g, \tits square is %g\n",
i,
A[i],
A[i]*A[i]
);
}// Declaration of various standard library functions.
// Here argument of 'n' refers to maximum blocks that can be
// allocated which is guaranteed to be non-negative.
void *malloc(size_t n);
// While copying 'n' bytes from 's2' to 's1'
// n must be non-negative integer.
void *memcpy(void *s1, void const *s2, size_t n);
// strlen() uses size_t because the length of any string
// will always be at least 0.
size_t strlen(char const *s);Output
Infinite loop and then segmentation fault// C program to demonstrate that size_t or
// any unsigned int type should be used
// carefully when used in a loop.
#include<stdio.h>
#define N 10
int main()
{
int a[N];
// This is fine.
for (size_t n = 0; n < N; ++n) {
a[n] = n;
}
// But reverse cycles are tricky for unsigned
// types as they can lead to infinite loops.
for (size_t n = N-1; n >= 0; --n)
printf("%d ", a[n]);
}