#include <iostream> #include <climits> #include <iomanip> using namespace std; int main() { int posnum, ctr, sum, max = 0; int min = INT_MAX; int terval = -1; cout << "\n\n Input a positive integers to calculate some processes or -1 to terminate:\n"; cout << "----------------------------------------------------------------------------\n"; cout << " Input positive integer or " << terval << " to terminate: "; while (cin >> posnum && posnum != terval) { if (posnum > 0) { ++ctr; sum += posnum; if (max < posnum) max = posnum; if (min > posnum) min = posnum; } else { cout << "error: input must be positive! if negative, the value will only be -1! try again..." << endl; } cout << " Input positive integer or " << terval << " to terminate: "; } cout << "\n Your input is for termination. Here is the result below: " << endl; cout << " Number of positive integers is: " << ctr << endl; if (ctr > 0) { cout << " The maximum value is: " << max << endl; cout << " The minimum value is: " << min << endl; cout << fixed << setprecision(2); cout << " The average is " << (double)sum / ctr << endl; } }
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OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.
#include <iostream>
#include <string>
using namespace std;
int main()
{
string name;
cout << "Enter name:";
getline (cin, name);
cout << "Hello " << name;
return 0;
}
C++ is a widely used middle-level programming language.
When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) {
//code
}
else {
//code
}
You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to If-Else-If ladder.
switch(conditional-expression){
case value1:
// code
break; // optional
case value2:
// code
break; // optional
......
default:
code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while (condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
// code
}