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;
}