C: stacks ... Please help fix the Error //  warning: implicit declaration of function 'isdigit' [-Wimplicit-function-declaration]          if(isdigit(*ex))             ^~~~~~~  // ......... #include int Stack[30]; // storing the stack values int top = -1; // it will show stack is empty   void PUSH(int x) {     Stack[++top] = x; // inserting elements in the stack }   int POP() {     return Stack[top--]; // poping elements in the stack }   int main() {     char exp[20];     char *ex;     int n1,n2,n3,num;     printf("Enter the expression :: ");     scanf("%s",exp);     ex = exp;     while(*ex != '\0')     {         if(isdigit(*ex))         {             num = *ex - 48;             PUSH(num);         }         else         {             n1 = POP();             n2 = POP();             switch(*ex)             {             case '+':             {                 n3 = n1 + n2;                 break;             }             case '-':             {                 n3 = n2 - n1;                 break;             }             case '*':             {                 n3 = n1 * n2;                 break;             }             case '/':             {                 n3 = n2 / n1;                 break;             }             }             PUSH(n3);         }         ex++;     }     printf("\nThe result of expression %s = %d\n\n",exp,POP());     return 0; }

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