Stack Program #2

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16. Write a program to determine if an input string is of the form “aibi” where i >= 1 using Stack.i.e. Number of ‘a’ should be equal to number of ‘b’ (Example - ab, aabb, abab etc. are valid and
aab, bba etc. are invalid strings.)

#include<stdio.h>
#define n 50
char s[n];
int top=-1;

void push(char) ;
char pop();

void main()
{
    char str[50],countb=0,i,x;
    printf("enter a string which containing a and b = ");
    scanf("%s", str);
    while(str[i]!='\0')
    {
        if(str[i]=='a')
        {
            push(str[i]);
        }
        else if(str[i]=='b')
        {
            countb++;
        }
        i++;
    }
    while(top!=-1)
    {
        x=pop();
        countb=countb-1;
    }
    if(countb==0)
    {
            printf("valid string \n \n");
    }
    else
    {
            printf("invalid string \n \n");
    }
}
void push(char x)
{
    if(top>=n-1)
    {
        printf("stack overflow");
    }
    else
    {
        top++;
        s[top]=x;
    }
}
char pop()
{
    if(top==-1)
    {
        return 'z';
    }
    else
    {
        top=top-1;
        return s[top+1];
    }
}

Output

  • enter a string which containing a and b = abab
    valid string 
  • enter a string which containing a and b = abbab
    invalid string



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