1./*编译器:VC6.0*/
#include<stdio.h>
#define ERROR 404//错误时返回的值
//函数声明
int caculation(char*,int,int);//计算函数(返回404时为无用)
//主函数
int main()
{
int a,b,c;
char name[5];
printf("请输入 指令 确认输入并按下回车后再次输入 数字 数字");
gets(name);
scanf("%d%d",&a,&b);
c=caculation(name,a,b);
printf("计算结果为%d\n",c);
return 0;
}
//函数定义
int caculation(char *name,int a,int b)
{
int i=0,x=0,c;
char add[]="add",sub[]="sub",mux[]="mux",dive[]="dive";
while(!name[i])
{
if(name[i]==add[i]&&(x==1||x==0))
x=1;
else if(name[i]==sub[i]&&(x==2||x==0))
x=2;
else if(name[i]==mux[i]&&(x==3||x==0))
x=3;
else if(name[i]==dive[i]&&(x==4||x==0))
x=4;
else
{
x=0;
break;
}
}
switch(x)
{
case 1:c=a+b;break;
case 2:c=a-b;break;
case 3:c=a*b;break;
case 4:c=a/b;break;
default:c=ERROR;
}
return c;
}
2.
/*编译器:VC6.0*/
#include<stdio.h>
//函数声明
int my_strcmp(char*,char*);
//主函数
int main()
{
char s1[]="hello world",s2[]="hello abc";
int flag=my_strcmp(s1,s2);
if(flag==0)
printf("%s等于%s\n",s1,s2);
else if(flag>0)
printf("%s大于%s\n",s1,s2);
else
printf("%s小于%s\n",s1,s2);
return 0;
}
int my_strcmp(char *s1,char *s2)
{
int i=0,j=0,x;
while(!s1[i])i++;
while(!s2[j])j++;
if(i==j)
x=0;
else if(i>j)
x=1;
else
x=-1;
return x;
}