Stack using C

Stack using C

PROGRAM : For Stack using C


#include <stdio.h>

#include <stdlib.h>


#define MAX 4



struct stack

{

    int a[MAX];

    int top;

}st;

int stfull(){

    if(st.top>=MAX-1)return 1;

    else return 0;

}

int push(int val){

    st.top++;

    st.a[st.top]=val;

}

int stempty(){

    if(st.top==-1)return 1;

    else return 0;

    }

int pop(){

    st.top--;

    return 0;

    }

int display(){

    int i;

    if(stempty()==1)printf("\nstack is empty\n");

    else{

            printf("\n");

    for(i=st.top;i>=0;i--){

        printf("|%d|",st.a[i]);

        }

    }

    return 0;

}


/* Main function */
    int main()

{

 int val;

 int choice;

    st.top=-1;

   label:



    printf("\nselect the choice\n");

    printf("1=push\n2=pop\n3=peep\n4=display\n5=clear screen\n");

    scanf("%d",&choice);



    switch(choice){

        case 1:



            if(stfull()==1){

                printf("\nstack is full\n");

            }

            else{

                printf("\nenter value=");

            scanf("%d",&val);

                push(val);

            }

                goto label;

            break;





        case 2:

            if(stempty()==1){printf("\nstack is empty\n");}

            else {

                    printf("\n%d deleted\n",st.a[st.top]);

                    val=pop();



            }

            goto label;

            break;

        case 3:  printf("\n a[st.top]=%d",st.a[st.top]);



            goto label;

           break;

      case 4:

          display();

          goto label;

          break;

      case 5:

         system("cls");

         goto label;

           break;

        default:

            exit(0);

    }



    return 0;

}

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