程序代码：

[local]1[/local]#include<stdio.h>
#include<stdlib.h>
void main()
{
    FILE *fp;
    int i=0;
    char str[100];
    if((fp=fopen("d:\\text.txt","w"))==NULL)
    {
        printf("cannot open");
        exit(0);
    }
    printf("Iput the sting:\n");
    gets(str);
    while(str[i])
    {
        if(str[i]>='a'&&str[i]<='z')
            str[i]+=32;
        fputc(str[i],fp);
        i++;
    }
    fclose(fp);
    fp=fopen("d:\\text.txt","r");
    fgets(str,100,fp);
    printf("%s\n",str);
    fclose(fp);
}

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