#include<iostream> #include<fstream> #include<stdio.h> using namespace std; float leastValue(float a,float b,float c){ if(a<=b && a<=c) return a; else if(b<=a && b<=c) return b; else return c; } int main() { //Declarations fstream P1,P2,P3; // File Stream for P1,P2,P3 float A,B,C; //float variables P1.open("p1.txt", ios::in | ios::out | ios::app); // open P1 "p1.txt" in read and write mode P2.open("p2.txt", ios::in | ios::out | ios::app); // open P2 "p2.txt" in read and write mode P3.open("p3.txt", ios::in | ios::out | ios::app); // open P3 "p3.txt" in read and write mode P1>>A>>B>>C; // read A,B and C from P1 P1.clear(); // *** clear the eof flag P1<<"\nLeast Value = "<<leastValue(A,B,C); //write on file P1, the least value from A,B,C P2>>A>>B>>C; // read A,B and C from P1 P2.clear(); P2<<"\nLeast Value = "<<leastValue(A,B,C); //write on file P1, the least value from A,B,C P3>>A>>B>>C; // read A,B and C from P1 P3.clear(); P3<<"\nLeast Value = "<<leastValue(A,B,C); //write on file P1, the least value from A,B,C P1.close(); // close P1 P2.close(); // close P2 P3.close(); // close P3 return 0; }
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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
}