cplusplus:selection_examples
This is an old revision of the document!
Table of Contents
Control Structures: Selection examples
if
- if_example.cpp
/* Using if statements */ #include <iostream> using namespace std; int main() { int grade; cout << "Enter a grade and I will tell you if you passed: "; cin >> grade; if (grade > 60) cout << "Passed" << endl; return 0; }
if/else
- if_else_example.cpp
/* Using if/else statements */ #include <iostream> using namespace std; int main() { int num1; cout << "Enter an integer, and I will tell you "; cout << "if the number is positive: "; cin >> num1; // read an integer if (num1 > 0) cout << num1 << " is positive. "<< endl; else cout << num1 << " is not positive. "<< endl; return 0; }
nested if/else
- nested_if_else_example.cpp
/* Using nested if/else statements */ #include <iostream> using namespace std; int main() { int grade; cout << "Enter a numerical grade, and I will tell you" << endl; cout << "how well the student performed: "; cin >> grade; // read an integer cout << "The student received a letter grade of "; if (grade >= 90 ) cout << "A"; else if (grade >= 80) cout << "B"; else if (grade >= 70) cout << "C"; else if (grade >= 60) cout << "D"; else cout << "F"; cout << "." << endl; return 0; }
validating input
- validating_input_example.cpp
/* Using logical operators to validate input */ #include <iostream> using namespace std; int main() { int grade; cout << "Enter a numerical grade, and I will tell you" << endl; cout << "how well the student performed: "; cin >> grade; // read an integer if (grade >= 0 && grade <= 100) { cout << "The student received a letter grade of "; if (grade >= 90 ) cout << "A"; else if (grade >= 80) cout << "B"; else if (grade >= 70) cout << "C"; else if (grade >= 60) cout << "D"; else cout << "F"; cout << "." << endl; } else cout << "The grade must be between 0 and 100." << endl; return 0; }
comparing characters
- comparing_characters.cpp
/* Comparing characters */ #include <iostream> using namespace std; int main() { char ch; // Get a character from the user. cout << "Enter a letter: "; ch = cin.get(); // Did user enter a letter? if (ch >= 'a' && ch <= 'z') cout << "You entered a character between 'a' and 'z'." << endl; else cout << "You entered something else." << endl; return 0; }
cplusplus/selection_examples.1360291597.txt.gz · Last modified: 2013/02/08 02:46 by mithat