C Program to replace lowercase vowels to uppercase in a string
Here is the C program to replace lowercase vowels to uppercase in a string
#include<stdio.h>
#include<conio.h>
void main()
{ char str[200];
int i=0;
clrscr();
printf(“Enter a String:”);
gets(str); // can also use fgets(str,200,stdin);
printf(“Actual String:”);
puts(str);
for(i=0;str[i]!=’\0′;i++)
{ if(str[i]==’a’ ||str[i]==’e’ ||str[i]==’i’ ||str[i]==’o’ ||str[i]==’u’)
{ str[i]=str[i]-32; //to convert lower case vowels to upper case
}
}
printf(“Converted string:%s”,str);
getch();
}
Output
Logic of program
- The vowels(a,e,i,o,u) in lowercase can be converted into uppercase by using the logic of ASCII value.
- The ASCII value of lower characters(a-z) is 97-122 respectively and uppercase character(A-Z) is 65-90 respectively.
- So here it is clearly seen the difference in ASCII values of lowercase and uppercase characters is 32.
- So if the 32 is subtracted from the ASCII value of lowercase charater than it can be converted into uppercase character and vice-versa.
- The loop used i.e for loop which will go to every single character of the string starting from i=0 to the null character(‘\0’).
- If is used for making a condition that if the character in a string is vowel than it will follow the condition written in it and will convert it to uppercase.
