Write a Java program to implement stack by creating user defined push method for entering { and (, and pop method for retrieving { and ( from the stack. This program is for expression evaluation and syntax parsing. Your program should display appropriate error message if input expression has wrong. 

 

Pseudo Code Example:

int howMany=5;
String[] myStatement= new String[howMany];
char[] myStack= new char[40];
int stackTop;

// Main method
myStatement[0]="( 1 + 3) * { 2 - 1 )";

...

myStatement[4]="( 1 + 3) * ((2 - 1 )";

 for (int i=0;i   stackTop=-1;
   for (int j=0;j      char c= myStatement[i].charAt(j);
      if (c=='{' || c=='(') {
          myPush(c);
      }
    if (c=='}') {
       char popedChar=myPop();
      // check correct or not
    }
    if (c==')') {
       char popedChar=myPop();
      // check correct or not
   }
}

 

 

public static void myPush(char c){
// push operation
}

public static char myPop(){
// pop operation
return c;
}
 

 

// expected output

( 1 + 3) * { 2 - 1 )
                       ^ error: '}' expected

Answer rating: 100% (QA)

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