console application - C++ - Repeat std::getline() as user integer input? -

how repeat std::getline() user number input method:

  std::string num;   std::cout << "how many subjects want sum: ";   std::getline (std::cin,num); 

then take user number input , repeat std::getline() many times input sum subjects marks user input them after first questions.

prefer not use std::getline inputting numbers.

you need standard pattern:

int quantity = 0; std::cout << "enter quantity of subjects sum: "; std::cin >> quantity; int sum = 0; (int = 0; < quantity; ++i) {     int value;     std::cin >> value;     sum += value; } 

a common data input format specify quantity first number on single line.

the data follow on subsequent lines, 1 number per line.

the operator>> skip whitespace (including newlines).

edit 1: using getline
if must use getline, remember reads in strings (characters). if want numbers, have convert text representation internal representation.

int quantity; std::string text_line; std::cout << "enter quantity sum: "; std::getline(std::cin, text_line); int sum = 0; // extract number text {     std::istringstream text_stream(text_line);     text_stream >> quantity; } (int = 0; < quantity; ++quantity) {     std::getline(std::cin, text_line);     std::istringstream text_stream(text_line);     int value = 0;     text_stream >> value;     sum += value; } 

notice difference in number of lines.

also, notice usage of std::istringstream. looks using std::cin in first example.

there other techniques convert text representation of numbers internal representation. these left reader research.