Alternate letters in upper case

Question

As the below code should convert the given String into alternative upper or lower case.A string S (only alphabets) is passed as input. The printed output should contain alphabets in odd positions in each word in uppercase and alphabets in even positions in each word in lowercase.

#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main()
{
char str[100];
int i;
scanf("%s",str);
for(i=0;str[i]!='\0';i++){
if((i%2)==1)
str[i]=tolower(str[i]);
else
str[i]=toupper(str[i]);
}
printf("%s",str);
return 0;
}

The input will be tREE GiVES us fruiTS and the expected output should be TrEe GiVeS Us FrUiTs BUT what im getting is just first string TrEe What should i do to get full string

Answer 1

scanf("%s, str) reads in a string until the first whitespace character. So when you type "tree gives us fruits" it reads in "tree" and then see's the whitespace and stops.

Try using fgets(str, 100, stdin) instead

https://www.cplusplus.com/reference/cstdio/fgets/