C :: How To Write A Program To Make The User Input With Text

I need to write a program to make the user input some text, and the first letter of each word has to be uppercase. (have to use while loops)

So for example lets say the user inputs:

i lOvE pRoGrAmMiNg

The output needs to be:

I Love Programming

Code: int main()
{
char c, lower_c;
printf("Enter Text");
while (c != '' && c >= 0)
{
if (c >= 'A' && c <= 'Z')
lower_c = c + 32;
else
lower_c = c;

[Code]...

I have started this code by making the letters lowercase (I don't know if this was the right way to approach this, ). I am not sure how proceed after this step, the step of making the first letter uppercase. (PS for the program, loops should be while loops)