Convert the code for C++ to C. theres also an error in it. Thanks! .... #include using namespace std; int precedence(char op){ if(op == '+'||op == '-') return 1; if(op == '*'||op == '/') return 2; return 0; } // this function will perform arithmetic operations. int applyOp(int a, int b, char op){ switch(op){ case '+': return a + b; case '-': return a - b; case '*': return a * b; case '/': return a / b; } } int evaluate(string tokens){ int i; //we are using stack to store integer values. stack values; // using this stack to store operators. stack ops; for(i = 0; i < tokens.length(); i++){ if(tokens[i] == ' ') continue; else if(tokens[i] == '('){ ops.push(tokens[i]); } else if(isdigit(tokens[i])){ int val = 0; while(i < tokens.length() && isdigit(tokens[i])) { val = (val*10) + (tokens[i]-'0'); i++; } i--; } else if(tokens[i] == ')') { while(!ops.empty() && ops.top() != '(') { int val2 = values.top(); values.pop(); int val1 = values.top(); values.pop(); char op = ops.top(); ops.pop(); values.push(applyOp(val1, val2, op)); } if(!ops.empty()) ops.pop(); } else { while(!ops.empty() && precedence(ops.top()) >= precedence(tokens[i])){ int val2 = values.top(); values.pop(); int val1 = values.top(); values.pop(); char op = ops.top(); ops.pop(); values.push(applyOp(val1, val2, op)); } // Push current token to 'ops'. ops.push(tokens[i]); } } while(!ops.empty()){ int val2 = values.top(); values.pop(); int val1 = values.top(); values.pop(); char op = ops.top(); ops.pop(); values.push(applyOp(val1, val2, op)); } return values.top(); } int main() { cout << evaluate("10 + 2 * 6") << "\n"; cout << evaluate("100 * 2 + 12") << "\n"; cout << evaluate("100 * ( 2 + 12 )") << "\n"; cout << evaluate("100 * ( 2 + 12 ) / 14"); return 0; }