fprintfAndFscanf简单操作

C语言fscanf和fprintf函数的用法详解（格式化读写文件）（代码转载）

#include<stdio.h>

#define N 2

struct stu{

char name[10];

int num;

int age;

float score;

} boya[N], boyb[N], *pa, *pb;

int main()

{

FILE *fp;

int i;

pa=boya;

pb=boyb;

if( (fp=fopen("D:\\demo.txt","wt+")) == NULL ){

puts("Fail to open file!");

exit(0);

}

//从键盘读入数据，保存到boya

printf("Input data:\n");

for(i=0; i<N; i++,pa++){

scanf("%s %d %d %f", pa->name, &pa->num, &pa->age, &pa->score);

}

pa = boya;

//将boya中的数据写入到文件

for(i=0; i<N; i++,pa++){

fprintf(fp,"%s %d %d %f\n", pa->name, pa->num, pa->age, pa->score);

}

//重置文件指针

rewind(fp);

//从文件中读取数据，保存到boyb

for(i=0; i<N; i++,pb++){

fscanf(fp, "%s %d %d %f\n", pb->name, &pb->num, &pb->age, &pb->score);

}

pb=boyb;

//将boyb中的数据输出到显示器

for(i=0; i<N; i++,pb++){

printf("%s  %d  %d  %f\n", pb->name, pb->num, pb->age, pb->score);

}

fclose(fp);

return 0;

}

原文链接：http://c.biancheng.net/view/2073.html