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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. /* run this program using the console pauser or add your own getch, system("pause") or input loop */
  5.  
  6.  
  7. int cal(char a[]){
  8. 	int i=0,num=0,;
  9. 	int result=0;
  10. 	char token='0';
  11.  
  12. 	while(a[i]!='\0'){
  13. 		if(a[i]>'9' || a[i]<'0'){
  14. 				token=a[i];
  15. 				i++;
  16. 				continue;
  17. 		}
  18.  
  19. 		num=0;
  20. 		while(a[i]<='9' && a[i]>='0'){
  21. 			num=num*10+(a[i]-'0');
  22. 			i++;
  23. 		}
  24.  
  25. 		switch(token){
  26. 			case '*':
  27. 				result*=num;
  28. 				break;
  29. 			case '/':
  30. 				result/=num;
  31. 				break;
  32. 			case '+':
  33. 				result+=num;
  34. 				break;
  35. 			case '-':
  36. 				result-=num;
  37. 				break;
  38.  
  39. 			default:
  40. 				result=num;
  41. 		}
  42. 	}
  43.  
  44. 	return result;
  45. }
  46.  
  47. int main(int argc, char *argv[]) {
  48. 	int sum;
  49. 	char s[25];
  50.  
  51. 	puts("請輸入字串：");
  52.     gets(s);
  53.     printf("輸出的字串為\n");
  54.     printf("%s \n",s);
  55. 	sum=cal(s);
  56. 	printf("輸出結果\n");
  57. 	printf("%d",sum);
  58.  
  59. 	return 0;
  60. }
  61.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.c: In function 'cal':
prog.c:8:16: error: expected identifier or '(' before ';' token
  int i=0,num=0,;
                ^
prog.c: In function 'main':
prog.c:52:5: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
     gets(s);
     ^
stdout
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Standard output is empty
https://ideone.com/MCkyx6
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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