#include <stdio.h>
 
int main() {
    int nilai, count = 0;
    float sum = 0;
 
    do {
 
        if (nilai >= 0) {
            sum += nilai;
            count++;
        }
 
    } while (nilai >= 0);
 
    if (count > 0)
        printf("Rata-rata nilai = %.2f\n", sum 
/ count
);     else
        printf("Tidak ada nilai valid.\n");  
    return 0;
}
 
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