invalid operands to binary %

Code:

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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define MAXZO 100

void findMinValue(int n, int *zo, int *tail)
{
        unsigned long i, j, d, zoValue;
        for (i = 0; i < MAXZO; i++)
                zo[i] = 0;
        *tail = (int)log(n);
        zo[*tail] = 1;
        do {
                zoValue = n;
                i = 0;
                while (zo[i] == 2) {
                        zo[i] = 0;
                        zo[++i]++;
                }
                if (*tail > MAXZO) exit(0);
                if (zo[*tail+1] == 1) *tail++;
                for (i = 0; i <= *tail; i++) {
                        if (zo[i] == 1) {
                                d = pow(10, (int)log(n)+1) % n;
                                for (j = i; j <= (int)i/log(n); j++)
                                        zoValue = (zoValue*d) % n;
                        }
                        zoValue = (zoValue*pow(10, n-(int)i/log(n))) % n;
                }
                printf("%d\n", zoValue);
                zo[0]++;
        } while (zoValue != 0);
}

int main()
{
        FILE *fr, *fw;
        int n, tail, i;
        int zo[MAXZO];
        fr = fopen("02.dat", "rt");
        fw = fopen("02.out", "wt");
        fscanf(fr, "%d", &n);
        findMinValue(n, zo, &tail);
        for (i = 0; i <= tail; i++)
                fprintf(fw, "%d", zo[i]);
        fclose(fr);
        fclose(fw);
        return 0;
}

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I just want to use module operator. But it didn't work.

Code:

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mathsniper:~# gcc -O2 -o 02 02.c -lm
02.c: In function ‘findMinValue’:
02.c:24: error: invalid operands to binary %
02.c:28: error: invalid operands to binary %

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The % operator does not work with doubles, which pow returns.

One example of your problem is this line;

Code:

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d = pow(10, (int)log(n)+1) % n;

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as pow() returns a double. The % operator is only defined for integral types (int, long, unsigned, etc) and has no defined meaning for floating point types.

To get a sort-of equivalent functionality for arguments of type double, look up the function fmod() which is declared in <math.h>

The problem was solved. Thanks. :)