C语言及程序设计初步例程-42 将数据输出到文本文件

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;}