Question

一段很简单的C语言代码，看不懂，求高手解答

#include <stdio.h>

void main()
{
charstr[40];
intcmp( char *str1, char *str2 );

printf("Pleaseenter the website you like the best : ");
scanf("%s",str);

#ifndef CORRECT
#define CORRECT "fishc.com"
#endif

if(cmp( str, CORRECT ) == 0 )
{
printf("\nYeah!You are a smart man!\n\n");
}
else
{
printf("\nYoufool! Man!!\n\n");
}
}

int cmp( char *str1, char *str2 )
{
inti = 0, j = 0;

while(str1[i] )
{
while(str2[j] == str1[i] )
{
i++;
j++;
if(!str2[j] )
{
return0;
}
}
j= 0;
i++;
}

return-1;
}

cmp( , )函数中，while循环是怎么实现各个字符比较？
if(!str2[j] )又是什么意思啊。

Answer 1

scanf("分数= %d\n",&score);是错的，这样会导致你无法输入任何数据。 不信你可以先给score赋一个初值，然后 printf("%d",score);就会发现score永远是初值。 应该写成scanf("%d",&score); 如果你需要显示“分数=”，应该再用一个printf #include<stdio.h>void main(){ int score; printf("请输入分数:\n"); scanf("%d",&score); printf("分数= %d\n",score); while((score<0)||(score>100)) { printf("错误，请重新输入\n"); scanf("分数= %d\n",&score); } switch(score) { case 100:printf("%s","A");break; case 90 :printf("%s","B");break; case 80 :printf("%s","C");break; case 70 :printf("%s","D");break; case 60 :printf("%s","D");break; case 50 :printf("%s","D");break; case 40 :printf("%s","D");break; case 30 :printf("%s","D");break; case 20 :printf("%s","D");break; case 10 :printf("%s","D");break; case 0 :printf("%s","D");break; }}

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