方法一: #include<stdio.h> main() { FILE *fp; int i=0; char *s="Am I right?"; fp=fopen("c:\\text.txt","wr"); while(*s) { printf("%c",*s); fseek(fp,i++,SEEK_SET); fprintf(fp,"%c",*s++); } fclose(fp); getchar(); }
方法二:
#include <stdio.h> #include <conio.h> #include <stdlib.h> main() { FILE *fp; char ch; fp = fopen("F:\\file.txt","wb"); //写的方式打开文件,你把file.txt换成你自己的文件就ok if( fp == NULL) { printf("can't open file.txt\n"); exit(1); } //打开文件失败则退出 scanf("%c",&ch); while(ch != '*') //输入字符*则退出 { printf("%c\n",ch); fputc(ch,fp); //将ch写入你打开的文件 fflush(stdin); //清除输入缓冲区 scanf("%c",&ch); //继续输入一个字符 } printf("input over!\n"); getch(); }
方法三:
#include <stdio.h> #include <stdarg.h>
void xprintf(const char *pszFormat, ...) { char buf[1024] = {0}; FILE *cfPtr = fopen("1.log", "a"); va_list arg_ptr; va_start(arg_ptr, pszFormat); vsprintf(buf, pszFormat, arg_ptr); va_end(arg_ptr); printf("%s", buf); if (cfPtr!=NULL) { fprintf(cfPtr, "%s", buf); fclose(cfPtr); } }
int main(int argc, char *argv[]) { xprintf("%-10d%s\n", 99, "hello world"); return 0; }
方法四:
void WriteDat(void) { int i;
char xx[2][23]={"You He Me","I am a student."};//测试数据. FILE *fp;
fp=fopen("OUT6.txt","a+"); for(i=0;i<2;i++) { printf("%s\n",xx[i]);//运行时在屏幕上显示 fprintf(fp,"%s\n",xx[i]);//写入文件, } fclose(fp); }
方法五:
手动可以用重定向 a.out > out.txt 程序实现可以用fprintf #include<stdio.h> main() { FILE *fp; int i=0; char *s="Am I right?"; fp=fopen("c:\\text.txt","wr"); while(*s) { printf("%c",*s); fseek(fp,i++,SEEK_SET); fprintf(fp,"%c",*s); s++; } fclose(fp); getchar(); } 
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