Analog simple arithmetic operation. Suppose only calculator arithmetic operations, operands and results are integers, the same four kinds of operator precedence is calculated from left to right.
Input format:
input is given in a four row arithmetic expression, there is no space, and at least one operand. In case of equal sign "=" Enter the end of the description.
Output format:
outputting a calculation result of expression in a row, or if the denominator of the division is 0 or illegal operator outputs an error message "ERROR".
Sample input:
1 + 2 * 10-10 / 2 =
Sample output:
10
#include<stdio.h>
int main()
{
int a,b;
char c;
scanf("%d",&a);
while(scanf("%c",&c))
{
switch(c)
{
case('+'):scanf("%d",&b);a+=b;break;
case('-'):scanf("%d",&b);a-=b;break;
case('*'):scanf("%d",&b);a*=b;break;
case('/'):scanf("%d",&b);if(b==0)
{
printf("ERROR");return 0;
}else
{
a/=b;break;
}
case('='):printf("%d",a);return 0;
default:printf("ERROR");return 0;
}
}
return 0;
}
Knowledge Point: switch-case statement can be used characters
