#include <stdio.h>
#include <windows.h>

void strrindex(char a[],char b[])
{
    int i,j;
        char k[1];
    for(i=10;a[i]!='\0';i++)
    {
        int n=10;                     
        for(j=0;b[j]!='\0';j++)
        {
           if(a[i]!=b[j]) break;
           i++;
           n++;
        }
        if(b[j]=='\0')
        {
            k[0]=i-n+1;
            printf("%d\n",k[0]);
            FILE *fw;
            fw=fopen("virusout.txt","w");
            fputs(k,fw);
            fputs("\n",fw);
            break;
        }
    }
   
}

void dely()
{   
    int i;
    for(i=3;i>=0;i--)
    {
        printf("倒计时:");
        printf("           %d\n",i);
        Sleep(5*400);//这里修改延时时间
    }  
}



void main()
 {
   printf("\n/************************题目：病毒查找************************/\n");
   printf("It's opening the infected file , please wait......\n");
   /*Sleep(5*1000);*/
   char str[5000],str2[]="Languages";
   FILE *fp;
   char ch;
   int i;
   fp=fopen("virusin.txt","r");
   if(fp)
   {
       int i=0;
       int ch=0;
       while(!feof(fp))
       {
           ch=fgetc(fp);
           if(ch==EOF)
               break;
           str[i]=ch;
           i++;
       }
       str[i]=0;
       fclose(fp);
   }
   puts(str);
   printf("******************************************************************************\n\n");
   strrindex(str,str2);
 }
怎么样把k的值写入txt文件中

fpirntf(fw,"%d",k);

2楼正解

按照你说的可以了。不错，再麻烦一下你，如果我再调用这个函数，怎么保证txt文件里面的数值不会被覆盖？而是继续记录一个值
void strrindex(char a[],char b[])
{
    int i,j,k;
    for(i=10;a[i]!='\0';i++)
    {
        int n=10;                     
        for(j=0;b[j]!='\0';j++)
        {
           if(a[i]!=b[j]) break;
           i++;
           n++;
        }
        if(b[j]=='\0')
        {
            k=i-n+1;
            printf("%d\n",k);
            FILE *fw;
            fw=fopen("virusout.txt","w");
            fprintf(fw,"%d",k);
            fputs("\n",fw);
            break;
        }
    }
   
}