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# C Library Function - tolower() [ C Standard Library - ](#) ## Description The C library function **int tolower(int c)** converts a given letter to lowercase. ## Declaration Here is the declaration for the tolower() function. int tolower(int c); ## Parameters * **c** -- This is the letter to be converted to lowercase. ## Return Value If c has a corresponding lowercase letter, the function returns the lowercase letter of c, otherwise c remains unchanged. The return value is an int value that can be implicitly converted to a char type. ## Example The following example demonstrates the usage of the tolower() function. ## Example #include#includeint main(){int i = 0; char c; char str[] = ""; while(str){putchar(tolower(str)); i++; }return(0); } Let's compile and run the above program, which will produce the following result: [ C Standard Library - ](#)