Write a menu driven program in 'C' which performs the following operations on strings.Write separate function for each option -Check if one string is substring of another string -Count number of occurrences of a character in the string. -Exit.

#include

void substring(void);
void occurance(void);

void main()
{
    int choice;
    clrscr();
    do
    {
printf("\nPRESS 1 TO CHECK WHEATHER STRING IS SUBSTRING OR NOT.");
printf("\nPRESS 2 TO COUNT OCCURRENCES OF CHARACTER IN STRING.");
        printf("\nPRESS 3 TO EXIT.");
        printf("\nENTER YOUR CHOICE::> ");
        scanf("%d",&choice);
        fflush(stdin);
        switch(choice)
        {
        case 1:
            substring();
            break;
        case 2:
            occurance();
            break;
        case 3:
            exit(0);
        }
    }while(choice != 3);
    getch();
}
void substring()
{
    int i,j,count = 0;
    char str[80],substr[80];
    printf("ENTER ANY STRING ::>\n");
    gets(str);
    printf("ENTER ANY STRING ::>\n");
    gets(substr);
    for(i = 0 ; substr[i] != '\0'; i++)
    {
        count++;
    }
    for(i = 0; str[i] != '\0'; i++)
    {
        j = 0;
        while(str[i] == substr[j] && substr[j] !=  '\0')
        {
            j++;
            i++;
        }
        if(count == j)
        {
              printf("IT IS SUBSTRING");
              break;
        }
    }
    if(count != j)
    {
        printf("IT IS NOT SUBSTRING");
    }
}
void occurance()
{
    int  i,count = 0;
    char str[80],ch;
    printf("ENTER ANY STRING ::>\n");
    gets(str);
    printf("ENTER ANY CHARACTER ::>\n");
    scanf("%c",&ch);
    fflush(stdin);
    for(i = 0; str[i] != '\0'; i++)
    {
        if(str[i] == ch)
        {
            count++;
        }
    }
    printf("%c OCCURS %d TIMES.",ch,count);
}