For the following types:
int
unsigned int
char
float
double
string

Identify which type is appropriate to store the following:
studendID's
scores from exams
readings from a scientific instrument
letters in a word
lines in a text document
temperature forecast for the public

Tell the result of the following expressions:
5 * 7
5.3 * 9.6
5 / 7
5.3 / 9.6
19 % 5
'a' + 3
'M'-'L'