【项目4-算工资】

从文件​​salary.txt​​中读入工人的工号、基本工资、奖金，将奖金全部增加20%（好事）后，将工号、基本工资、奖金和应发工资（前项目之和）保存到文件salarylist.txt中。

[参考解答]

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int num;  //读入的工号
    double salary, award; //工资、奖金
    FILE *fpin, *fpout;
    fpin=fopen("salary.txt","r");
    if(fpin==NULL)
    {
        printf("salary file open error!\n");
        exit(1);
    }
    fpout=fopen("salarylist.txt","w");
    if(fpout==NULL)
    {
        printf("cannot write to file!\n");
        exit(1);
    }
    while(fscanf(fpin, "%d %lf %lf", &num, &salary, &award)!=EOF)   //当读取成功……
    {
        award *=1.2;
        fprintf(fpout,  "%d %.2f %.2f %.2f\n", num, salary, award, salary+award );
    }
    printf("thanks, byebye!\n");
    fclose(fpout);
    fclose(fpin);          //读入完毕要关闭文件
    return 0;
}