贺老师教学链接 C语言及程序设计初步 本课讲解
文件的操作步骤
#include <stdio.h> #include <stdlib.h> int main() { FILE *fp; int i, d; fp=fopen("data.txt","w"); if(fp==NULL) { printf("File cannot open! " ); exit(0); } for(i=0; i<10; i++) { scanf("%d", &d); fprintf(fp,"%d\t", d); } fclose(fp); return 0; } 实用写文件方式之——格式化输出 #include <stdio.h> #include <stdlib.h> int main() { FILE *fp; int i, No; float salary; fp=fopen("data.csv","w"); if(fp==NULL) { printf("File cannot open! " ); exit(0); } //输入5名员工的工号，并保存到文件中 for(i=0; i<5; i++) { scanf("%d %f", &No, &salary); fprintf(fp,"%d, %.2f\n", No, salary); } fclose(fp); return 0; } 实用读文件方式之——格式化输入 #include <stdio.h> #include <stdlib.h> int main() { FILE *fp; int i, No; float salary; fp=fopen("data.csv","r"); if(fp==NULL) { printf("File cannot open! " ); exit(0); } //输入5名员工的工号，并保存到文件中 for(i=0; i<5; i++) { fscanf(fp, "%d,%f", &No, &salary); printf("%d\t%.2f\n", No, salary); } fclose(fp); return 0; } 实用写文件方式之——将字符写入文件 #include <stdio.h> #include <stdlib.h> int main() { FILE *fp; char c; if ((fp=fopen( "data.dat" , "w" ))==NULL) { printf("File cannot open!"); exit(0); } while((c=getchar())!=EOF ) fputc(c,fp ); fclose(fp); return 0; } 实用读文件方式之——从文件中读取字符 #include <stdio.h> #include <stdlib.h> int main() { FILE *fp; char c; if ((fp=fopen( "data.dat" , "r" ))==NULL) { printf("File cannot open!"); exit(0); } while((c=fgetc(fp))!=EOF) putchar(c); fclose(fp); return 0; }