Sum up a series

#include <stdio.h>

main()

{

int i, n, resp;

float sum;

do {

printf(

"\nAgain (1 = yes, 0 = no)? ");

scanf("%d", &resp);

if (resp) {

printf("n = ? ");

scanf("%d", &n);

sum = 0.0;

for(i = n; i > 0; i--)

sum +=

1/((float) i * (float) i);

printf("Sum = %f\n", sum);

}

} while (resp);

}

This is program pg136.c

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