Question

What is wrong with this computer science program? I have an error at line 22, saying "identifier 'gets' is undefined". How do I fix this?

#include<stdio.h>
#include<string.h>

int countvowel(char* str) {
   int i = 0, count = 0;
   while (str[i] != '\0') {
       if (str[i] == 'A' || str[i] == 'E' || str[i] == 'I' ||
           str[i] == 'O' || str[i] == 'U' || str[i] == 'a' ||
           str[i] == 'e' || str[i] == 'i' || str[i] == 'o' ||
           str[i] == 'u') {
           count++;//count vowels
       }
       i++;
   }
   return count;
}
int main()
{
   int n;
   char str[100];
   printf("Enter a string for count vowels: ");
   gets(str); //take input a string from user
   n = countvowel(str); //Call the function to count vowels
   printf("\n No. of vowels are : %d", n);
   return 0;
}

Answer 1

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int countvowel(char* str) {
   int i = 0, count = 0;
   while (str[i] != '\0') {
       if (str[i] == 'A' || str[i] == 'E' || str[i] == 'I' ||
           str[i] == 'O' || str[i] == 'U' || str[i] == 'a' ||
           str[i] == 'e' || str[i] == 'i' || str[i] == 'o' ||
           str[i] == 'u') {
           count++;//count vowels
       }
       i++;
   }
   return count;
}
int main()
{
   int n;
   char str[100];
   printf("Enter a string for count vowels: ");
   scanf ("%[^\n]s", str); //take input a string from user
   n = countvowel(str); //Call the function to count vowels
   printf("\n No. of vowels are : %d", n);
   return 0;
}


gets() is deprecated
you can use scanf to read space separated strings