#include <iostream> using namespace std; const int N = 250; int a[N], b[N], c[N]; int main() { string s1, s2; cin >> s1 >> s2; int len = max(s1.size(), s2.size()); for (int i = s1.size() - 1, j = 0; i >= 0; i--, j++) { a[j] = s1[i] - '0'; } for (int i = s2.size() - 1, j = 0; i >= 0; i--, j++) { b[j] = s2[i] - '0'; } int t = 0; // t 代表进位 for (int i = 0; i < len; i++) { t = t + a[i] + b[i]; c[i] = t % 10; // 当前位的值 t /= 10; // 每次的进位 } if (t > 0) c[len++] = t; for (int i = len - 1; i >= 0; i--) { cout << c[i]; } 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
}