等级考试上机题目(上课用)(17)

#include <stdio.h>

char *fun (char *s, char *t)

{

}

main()

{char a[20],b[20];

void NONO ();

printf("Input 1th string:");

gets(a);

printf("Input 2th string:");

gets(b);

printf("%s\n",fun (a, b));

NONO ();

}

void NONO ()

{/* 本函数用于打开文件，输入数据，调用函数，输出数据，关闭文件。*/

FILE *fp, *wf ;

int i ;

char a[20], b[20] ;

fp = fopen("in.dat","r");

wf = fopen("out.dat","w");

for(i = 0 ; i < 10 ; i++) {

fscanf(fp, "%s %s", a, b);

fprintf(wf, "%s\n", fun(a, b));

}

fclose(fp);

fclose(wf);

}

17