C语言及程序设计进阶例程-36 文件的随机读写

贺老师教学链接 C语言及程序设计进阶 本课讲解

示例：写到尾再从头读

#include<stdio.h> #include<stdlib.h> int main() { int a[10], b[10], i; FILE *iofile; if((iofile=fopen("f1.dat","w+"))==NULL) /*用读写方式打开*/ { printf("Cannot open file!"); exit(1); } printf("enter 10 integer numbers:\n"); for(i=0; i<10; i++) { scanf("%d", &a[i]); fprintf(iofile, "%d ", a[i]); } printf("The numbers have been writen to file. \n"); printf("Display the data by read from file: \n"); fseek(iofile, 0, SEEK_SET); //亦可rewind(iofile); for(i=0; i<10; i++) { fscanf(iofile, "%d", &b[i]); printf("%d ", b[i]); } printf("\n"); fclose(iofile); return 0; }