C Programming Code Examples C > Strings Code Examples Program to Convert String into Lowercase Using Library Function Program to Convert String into Lowercase Using Library Function #include<stdio.h> #include<string.h> int main() { char *string = "Happy Codings - C Programming Language"; printf("\nString before to strlwr : %s", string); strlwr(string); printf("\nString after strlwr : %s", string); return (0); }