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history_source/信息学奥赛一本通/1.6.1.1.cpp

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+#include<cstdio>
+using namespace std;
+int run_(int a,int b,char c)
+{
+	switch(c)
+	{
+		case '+':return a+b;
+		case '-':return a-b;
+		case '*':return a*b;
+		case '/':return a/b;
+		case '%':return a%b;
+	}
+}
+bool can(char a)
+{
+	if(a=='+') return 0;
+	if(a=='-') return 0;
+	if(a=='*') return 0;
+	if(a=='/') return 0;
+	if(a=='%') return 0;
+	return 1;
+}
+int main()
+{
+	int a=0,b=0;
+	char f;
+	while(f=getchar(),f>='0'&&f<='9') a=a*10+(f-'0');
+	while(can(f)) f=getchar();
+	char w=' ';
+	while(w==' ') w=getchar();
+	b=w-'0';
+	while(w=getchar(),w!='\n') b=b*10+w-'0';
+	printf("%d\n",run_(a,b,f)); 
+	return 0;
+}
+