CODE[VS]1023 GPA计算

题目：http://codevs.cn/problem/1023/
题解：

/* 1023 GPA计算 */#include <stdio.h>#define DEBUG/* 主函数入口 */ int main(int argc, char *argv[]) {    int n;                      /* 课目数 */    float score, credit, gpa;   /* 成绩，学分，gpa */     float sum_credit;           /* 总学分 */    int i;                      /* 索引值 */ #ifdef DEBUG        FILE *fp;    if(NULL == (fp = fopen("data.txt", "r"))){        return 1;    }#endif    /* 获取课目数 */#ifdef DEBUG    fscanf(fp, "%d", &n); #else    scanf("%d", &n)#endif    sum_credit = 0.0;    gpa = 0.0;    /* 获取课目成绩和学分 */    for(i = 1; i <= n; i++){#ifdef DEBUG        fscanf(fp, "%f %f", &credit, &score);#else        scanf("%f %f", &credit, &score);#endif        sum_credit = sum_credit + credit;        gpa = gpa + credit * score;    }     /* 计算GPA结果 */    gpa = gpa / sum_credit;    /* 输出结果 */    printf("%0.2f", gpa);     return 0;}