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I am trying to print a 2d array like this.
1,2
3,4
5,6
7,8
until 20
and this is the code
#include <iostream>
using namespace std;
int main()
{
int A[10][2]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
for(int i=0;i<10;i++)
for(int j=0;j<2;j++)
{
cout<<A[i][j]<<" ";
}
cout << endl;
}
But everytime it prints it prints them in straight line , like 1 2 3 4 5 6............. What could I be doing wrong?
Hey there you forgot to add {} after first for loop.
Here's solution
#include <iostream>
using namespace std;
int main()
{
int A[10][2]={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
for(int i=0;i<10;i++)
{
for(int j=0;j<2;j++)
{
cout<<A[i][j]<<" ";
}
cout << endl;
}
}
Related
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my knowledge of c++ is pitiful. I've been stumped on this simple problem for a long time and would just a point to the right the direction. The basis of the program is to have the user chose a number 1-5 and then based on their decision print out a quote that many times. So if they chose the number 4 it will display the quote 4 times.
Here is what I have so far:
#include "stdafx.h"
#include <iostream>
#include <conio.h>
using namespace std;
int PickNumber()
{
int i;
cout << "Please Enter a Number From 1 to 5:";
cin >> i;
for (int j = 0; j < i; j++)
{
cout << "Congrats!";
}
return i;
}
int main()
{
_getch();
return 0;
}
Just to add an answer to this question already solved by #molbdnilo, #Rietty and #Gox: the PickNumber() function is not called in the main function.
The PickNumber() call just needs to be added to the main function.
int main() {
PickNumber();
return 0;
}
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I'm a student who just learned to use C++ for a few weeks. I write C++ code on Code:: Block and I am trying to run this code to learn about vector:
#include <iostream>
#include <vector>
#include <string>
using namespace std;
int main()
{
vector<int> intVector;
for(int i = 0; i < 10; i++)
{
intVector.push_back(i+1);
}
cout << "Numbers in vector: ";
for(int i = 0; i < intVector.size(); i++)
{
cout << intVector[i] + " ";
}
}
But the output is really weird:
Numbers in vector: vector::_M_emplace_back_auxector::_M_emplace_back_auxctor::_M_emplace_back_auxtor::_M_emplace_back_auxor::_M_emplace_back_auxr::_M_emplace_back_aux::_M_emplace_back_aux:_M_emplace_back_aux_M_emplace_back_aux
Process returned 0 (0x0) execution time : 0.047 s
Press any key to continue.
Does anyone know how to fix this problem? Do I use vector in the wrong way?
Try changing the cout line like this:
cout << intVector[i] << " ";
What you're trying to do is add an int& and a string literal -- in some compilers it will emit a warning indicating for you that you're not getting what you intended for.
For example with Clang:
warning: adding '__gnu_cxx::__alloc_traits>::value_type' (aka 'int') to a string does not append to the string [-Wstring-plus-int]
cout << intVector[i] + " ";
~~~~~~~~~~~~~^~~~~
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I made a function that will reverse the string, but the output of the reversed string always shifts towards the right by one character.
#include <iostream>
#include <string>
using namespace std;
void reverse(string string1)
{
cout << endl;
for (int i = string1.size(); i >= 0; i--)
{
cout << string1[i];
}
cout << endl;
}
int main()
{
string string1;
getline(cin, string1);
reverse(string1);
system("pause");
return 0;
}
Your first output is of a character that does not exist.
std::string's leaky abstraction means that your first iteration is printing '\0', which apparently looks like a space in your configuration.
Begin at string1.size() - 1.
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Closed 8 years ago.
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What have I done wrong with the following code?
#include <iostream>
using namespace std;
main ()
{
int a;
int b;
int sum;
cout << "Enter first number \n";
cin >> a;
cout << "Enter second number \n";
cin >> b;
sum = a+b;
cout << "The sum of both numbers is" << sum << endl;
return 0;
}
Does the editor you are using tells errors, so the code is not executing? Or som exception rises? Or it is executing but nothing is shown? Please specify your problem accurately.
Anyway, you must use
int main ()
instead of
main()
Notice that your code returns a value. The last line of you code is:
return 0;
Thus, you must specify an int return type.
Check your initial lines with this.
#include <iostream>
using namespace std;
int main ()
{
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Closed 9 years ago.
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i m trying to run this piece of code i have written and i m getting this error.. DK why
i m working on windows 7 32 bit
my IDE is codeblocks and the compiler i m using is gcc
thanks for all the helpers
#include <conio.h>
#include <iostream>
//#include <vector>
using namespace std;
class A{
public:
int num[5];
void operator[](int x){
num[x]=3;
cout << num[x] <<<endl;
}
};
class B : public A{
public:
void func(){
(*this)[2];
}
};
int main(){
B b;
}
Please check this line
cout << num[x] <<<endl;
cout << num[x] <<<endl;
You have 3 < here instead of 2.
cout << num[x] <<<endl;
replace it with
cout << num[x] <<endl;
Remove the following character:
v
cout << num[x] <<<endl
^