#include <stdio.h> float gpa(int n, float* xuefen, float* jidian) { float sum = 0, xuefensum = 0; for (int i = 0; i < n; i++) { sum += (xuefen[i] * jidian[i]); xuefensum += xuefen[i]; } return sum / xuefensum; } int main() { int n; scanf("%d", &n); float xuefen[n], score[n], j...