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//请今后要用
char c;
scanf("%c",&c);
//时,都改为
char s[2];
char c;
scanf("%1s",s);
c=s[0];
//自动跳过一个或多个空格或Tab字符或回车换行,读取下一个字符。
#include <stdio.h>
char s[]="123 ab 4";
char *p;
int v,n,k;
void main() {
p=s;
while (1) {
k=sscanf(p,"%d%n",&v,&n);
printf("k,v,n=%d,%d,%d\n",k,v,n);
if (1==k) {
p+=n;
} else if (0==k) {
printf("skip char[%c]\n",p[0]);
p++;
} else {//EOF==k
break;
}
}
printf("End.\n");
}
//k,v,n=1,123,3
//k,v,n=0,123,3
//skip char[ ]
//k,v,n=0,123,3
//skip char[a]
//k,v,n=0,123,3
//skip char[b]
//k,v,n=1,4,2
//k,v,n=-1,4,2
//End.
#include <stdio.h>
int main(void)
{
int a, b;
char c;
scanf("%d %c %d", &a, &c, &b);
switch (c) {
case '+':
printf("%d %c %d = %d\n", a, c, b, a+b);
break;
case '-':
printf("%d %c %d = %d\n", a, c, b, a-b);
break;
case '*':
printf("%d %c %d = %d\n", a, c, b, a*b);
break;
case '/':
if (b != 0)
printf("%d %c %d = %d\n", a, c, b, a/b);
else
printf("b== 0\n");
break;
case '%':
if (b != 0)
printf("%d %c %d = %d\n", a, c, b, a%b);
else
printf("b== 0\n");
break;
}
return 0;
}
上一个回帖有bug,改一下,%运算,除数也不能为0#include <stdio.h>
int main(void)
{
int a, b;
char c;
scanf("%d %c %d", &a, &c, &b);
switch (c) {
case '+':
printf("%d %c %d = %d\n", a, c, b, a+b);
break;
case '-':
printf("%d %c %d = %d\n", a, c, b, a-b);
break;
case '*':
printf("%d %c %d = %d\n", a, c, b, a*b);
break;
case '/':
if (b != 0)
printf("%d %c %d = %d\n", a, c, b, a/b);
else
printf("b== 0\n");
break;
case '%':
printf("%d %c %d = %d\n", a, c, b, a%b);
break;
}
return 0;
}