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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <ctype.h>
  4. #include <string.h>
  5. #define MAXSIZE 101
  6.  
  7. int main(){
  8. 	int arr[MAXSIZE]={0};
  9. 	char inp[1000];
  10. 	fgets(inp, 1000, stdin);
  11. 	char * ptr = strtok(inp," ");
  12. 	int status=1;
  13. 	int i=0;
  14. 	do
  15.   	{
  16.   		if(atoi(ptr)!=0){
  17.   			i++;
  18.   			arr[i]=atoi(ptr);
  19.   		}else{
  20.   			switch(ptr[0]){
  21.   				case '-':
  22.   					if(i>1){
  23.   						arr[i-1]=arr[i-1]-arr[i];
  24.   						i--;
  25.   					}else{
  26.   						status=0;
  27.   					}
  28.   					break;
  29.   				case '+':
  30.   					if(i>1){
  31.   						arr[i-1]=arr[i-1]+arr[i];
  32.   						i--;
  33.   					}else{
  34.   						status=0;
  35.   					}
  36.   					break;
  37.   				case '*':
  38.   					if(i>1){
  39.   						arr[i-1]=arr[i-1]*arr[i];
  40.   						i--;
  41.   					}else{
  42.   						status=0;
  43.   					}
  44.   					break;
  45.   				case '/':
  46.   					if(i>1){
  47.   						arr[i-1]=arr[i-1]/arr[i];
  48.   						i--;
  49.   					}else{
  50.   						status=0;
  51.   					}
  52.   					break;
  53.   			}
  54.   		}
  55.     	ptr = strtok(NULL, " ");
  56.   	}while (ptr != NULL && status==1);
  57.   	if(status && i==1){
  58.   		printf("%d", arr[1]);
  59.   	}else{
  60.   		printf("error");
  61.   	}
  62. }
Success #stdin #stdout 0.01s 5312KB
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stdin
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1 0 + 3 4 - 5 * +
stdout
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error
https://ideone.com/Z3qHFP
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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