Complete the blank in C++ program in Figure 1 below to display the space, lower case and upper case numbers for “Great Day\n”. The answer should be the appropriate built in function that will perform...

Complete the blank in C++ program in Figure 1 below to display the space, lower case and upper case numbers for “Great Day\n”.
The answer should be the appropriate built in function that will perform the operation based on comment given.

Extracted text: char str[]="Great Day\n"; int cl=0,c2=0,c3=0; for (int i=0; i< str[i];="" cl="c1+1;" }="" if="" (.="" (str[i]))="" check="" for="" lower="" case="" {="" {="" cout="">< str[i];="" c3="c3+1;" }="" }=""><"#of space=""><><><"#of lower=""><><><"#of upper=""><><>