Program to count number of characters and print the vowels in the text.

String is nothing but the character array. In C programming if user want to accept the text with white spaces then user have use special format specifier instead of %s, which is known %[^character]. In this format specifier we can use any alphabet or back slash character constant at the place of character.
e.g. scanf("%s",text); here when we use first white space (tab key, enter key, space bar) the string terminates.
scanf("%[^\n]",text); here string accept the data till enter key(\n) is not encountered. So using this format specifier user can accept the text with white spaces. Here we use '\n' at the place of character.

Below is the program which counts total number of alphabets and total number of vowels in the given text.
Please include stdio.h and conio.h header files before main function.

//PROGRAM TO FIND TOTAL ALPHABETS AND TOTAL VOWELS IN GIVEN TEXT.
#include
#include
void main(void)
{
char text[100];
int i=0,c=0,v=0;
clrscr();
printf("Enter any text here\n");
scanf("%[^\n]",text);
clrscr();
printf("\n Given text is %s",text);
while(text[i]!='\0')
{
if((text[i]>=65 && text[i]<=90)||(text[i]>=97 && text[i]<=122))
{
c++;
}
if((text[i]=='a'||text[i]=='e'||text[i]=='i'||text[i]=='o'||text[i]=='u'||text[i]=='A'||text[i]=='E'||text[i]=='O'||text[i]=='I'||text[i]=='U'))
{
v++;
}
i++;
}
printf("\nTotal alphabets are %d ",c);
printf("\nTotal vowels are %d ",v);
getch();
}

In the above program in while loop condition '\0' is used. This '\0' is nothing but null character which is end of the string.