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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