#include <stdio.h>
#include <string.h>
#include <conio.h>
void main(void)
{
FILE*fin=fopen("F.txt","r");
FILE*fout=fopen("G.txt","w");
char s[256];
fscanf(fin,"%s",&s);
bool b = false;
for(int i = 0; i < strlen(s); i++)
{
if(s[i] < '0' || s[i] > '9')
{
b = true;
break;
}
}
if(!b) fprintf(fout,"%s\n",s);
} |