C
c
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#include <stdio.h>
#include <stdlib.h>
void factorial(int* input);
void math(int* n, int* r, int* d);
int main() {
int n, r;
printf("nCr\nEnter n: \n");
scanf("%d", &n);
printf("Enter r: \n");
scanf("%d", &r);
int d = n - r;
void (*ptr)(int*) = factorial;
ptr(&n);
ptr(&r);
ptr(&d);
math(&n, &r, &d);
return 0;
}
void factorial(int* input) {
int d = 1;
for (int i = *input; i > 0; i--) d *= i;
*input = d;
}
void math(int* n, int* r, int* d) {
printf("= %d", *n/(*r * *d));
}
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