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#include <stdio.h>
#include <stdlib.h>
const int MAXSIZE=100;
struct Stack
    {
        char data[MAXSIZE];
        int size;
    }
char Pop (Stack &S)
    {
        if (S.size==0)
            {
                printf ("Stack empty");
                return char(255);
            }
        S.size--;
        return S.data[S.size];
    }
 
void Push (Stack &S, char x)
    {
        if (S.size==MAXSIZE)
            {
                printf ("Stack>>>");
                return;
            }
        S.data[S.size]=x;
        S.size++;
    }
int main(void)
    {
        char br1[3] = { '(', '[', '{' };
        char br2[3] = { ')', ']', '}' };
        char s[80], upper;
        int i, k, OK;
        Stack S;
        printf("Enter stack: ");
        gets(s);
        S.size=0;
        OK=1;
    for (i=0; OK&&(s[i]!='\0'); i++)
        for (k=0; k<3; k++)
            {
                if (s[i]==br1[k])
                    {
                        Push (S, s[i]);
                        break;
                    }
                if (s[i]==br2[k])
                    {
                        upper=Pop(S);
                            if (upper!=br1[k])
                                OK=0;
                            break;
                    }
            }
    if (OK&&(S.size == 0))
        printf("\nRight\n");
    else printf("\nWrong\n");
}
 

prog.c:6:14: error: variably modified ‘data’ at file scope
         char data[MAXSIZE];
              ^
prog.c:9:1: error: expected ‘;’, identifier or ‘(’ before ‘char’
 char Pop (Stack &S)
 ^
prog.c:9:17: error: expected ‘)’ before ‘&’ token
 char Pop (Stack &S)
                 ^
prog.c:20:18: error: expected ‘)’ before ‘&’ token
 void Push (Stack &S, char x)
                  ^
prog.c: In function ‘main’:
prog.c:36:9: error: unknown type name ‘Stack’
         Stack S;
         ^
prog.c:38:9: warning: ‘gets’ is deprecated (declared at /usr/include/stdio.h:638) [-Wdeprecated-declarations]
         gets(s);
         ^
prog.c:39:10: error: request for member ‘size’ in something not a structure or union
         S.size=0;
          ^
prog.c:46:25: warning: implicit declaration of function ‘Push’ [-Wimplicit-function-declaration]
                         Push (S, s[i]);
                         ^
prog.c:51:25: warning: implicit declaration of function ‘Pop’ [-Wimplicit-function-declaration]
                         upper=Pop(S);
                         ^
prog.c:57:15: error: request for member ‘size’ in something not a structure or union
     if (OK&&(S.size == 0))
               ^
prog.c:60:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty