View Code of Problem 94

#include<stdio.h>
#include<math.h>
#include<string.h>
int main(){
	char a[100],b[100];
	int c[100];
	gets(a);
	int len=strlen(a);
	int top1=-1,top2=-1,i;
	for(i=0;i<len;i++){
		if(a[i]=='('){
			c[++top2]=-100;
		}
		else if(a[i]=='+'||a[i]=='-'||a[i]=='*'||a[i]=='/'){
		b[++top1]=a[i];
	}
		else if(a[i]>='0'&&a[i]<='9'){
			c[++top2]=a[i]-'0';
		}
		else if(a[i]==')'){
			char ch=b[top1];
			top1--;
			if(ch=='+'){
				int s=0;
				while(c[top2]!=-100){
					s+=c[top2];
					top2--;
				}
				c[top2]=s;
			}
			else if(ch=='-'){
				int sum=0,s=0;
				while(c[top2-1]!=-100){
					sum+=c[top2--];
				}
				s=c[top2]-sum;
				c[--top2]=s;
			}
		else if(ch=='*'){
				int s=1;
				while(c[top2]!=-100){
					s*=c[top2--];
				}
				c[top2]=s;
			}
			else if(ch='/'){
			    int sum=1,s=0;
				while(c[top2-1]!=-100){
					sum*=c[top2--];
				}
				s=c[top2]/sum;
				c[--top2]=s;
		}
	}
} 
	printf("%d\n",c[top2]);
}