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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. #include<stdio.h>
  6.  
  7. int output1;
  8.  
  9.  
  10. int strToInt(char * s)
  11. {
  12. 	int num=0,i=0;
  13.  
  14. 	for(int i=0;s[i];i++)
  15. 	{
  16. 		num = num*10 + s[i]-'0';
  17.  
  18. 	}
  19.  
  20.  
  21. 	return num;
  22. }
  23.  
  24. void parseExp(char * exp,int *a,int *b,int *c,char *op,int *missing)
  25. {
  26. 	int p=0;
  27. 	int order=0;
  28. 	int temp=0;
  29.  
  30. 	*a = -1;
  31. 	*b = -1;
  32. 	*c  = -1;
  33.  
  34. 	for (int i = 0; exp[i] ; ++i)
  35. 	{
  36. 		if( (exp[i]>='0' && exp[i]<='9') )
  37. 		{
  38. 			temp=0;
  39. 			while( (exp[i]>='0' && exp[i]<='9') )
  40. 			{
  41. 				temp = temp * 10 + exp[i]-'0';
  42. 				i++;
  43. 			}
  44. 			if (order==0)
  45. 			{
  46. 				*a = temp;
  47. 			}
  48. 			else if (order==1)
  49. 			{
  50.  
  51. 				*b= temp;	
  52. 			}
  53. 			else
  54. 			{
  55. 				*c =  temp ;
  56. 			}
  57. 			i--;
  58.  
  59. 		}
  60. 		else if (exp[i]=='X')
  61. 		{
  62. 			*missing = order ; 
  63. 		}
  64. 		else
  65. 		{
  66. 			if (order==0)
  67. 			{
  68. 				*op = exp[i];
  69. 			}
  70. 			order++;
  71.  
  72.  
  73. 		}
  74.  
  75. 	}
  76.  
  77.  
  78. 	printf("%s %d %d %d %c %d\n",exp,*a,*b,*c,*op,*missing );
  79.  
  80.  
  81.  
  82.  
  83. }
  84.  
  85. int performOp(int a,int b,char op)
  86. {
  87. 	switch(op)
  88. 	{
  89. 		case '+' : return a+b;
  90. 		case '-' : return a-b ;
  91. 		case '/' : return a/b;
  92. 		case '*' : return a*b;
  93. 	}
  94. }
  95.  
  96.  
  97. char invertOp(char op)
  98. {
  99. 	switch(op)
  100. 	{
  101. 		case '+' : return '-';
  102. 		case '-' : return '+' ;
  103. 		case '*' : return '/';
  104. 		case '/' : return '*' ;
  105.  
  106.  	}
  107.  
  108. }
  109.  
  110.  
  111. void arithmetic(char *input1)
  112. {
  113. 	int a,b,c;
  114. 	char op;
  115. 	int missing;
  116. 	parseExp(input1,&a,&b,&c,&op,&missing);
  117.  
  118. 	char op2 = invertOp(op);
  119.  
  120. 	if(missing==0)
  121. 	{
  122. 		output1 = performOp(c,b,op2);
  123. 	}
  124. 	else if (missing==1)
  125. 	{
  126. 		if(op=='/' || op=='-')
  127. 		{
  128. 			output1 =performOp(a,c,op);
  129.  
  130. 		}
  131. 		else
  132. 		{
  133. 			output1 =performOp(c,a,op2);
  134.  
  135. 		}
  136.  
  137. 	}
  138. 	else 
  139. 	{
  140. 		output1 = performOp(a,b,op);
  141.  
  142. 	}
  143.  
  144. 	// output1 = 0;
  145. }
  146.  
  147.  
  148.  
  149.  
  150.  
  151. int main() 
  152. {
  153. 	// your code goes here
  154. 	char str[100]="1+X=3";
  155. 	arithmetic(str);
  156. 	printf("%d",output1);
  157.  
  158.  
  159. 	return 0;
  160. }
Success #stdin #stdout 0s 16064KB
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1+X=3 1 -1 3 + 1
2
https://ideone.com/qHnTpn
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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