## Thursday, April 18, 2013

### Program to find average of 3 numbers in c++

```#include <iostream>
using namespace std;

const int NUM_SCORES = 3;

int main()
{
int score1, score2, score3;
float ave;
cout << "Enter 3 scores separated by spaces: ";
cin  >> score1 >> score2 >> score3;

ave = float(score1 + score2 + score3) / float(NUM_SCORES);

cout << "The average of " << score1 << ", " << score2 << ", and "
<< score3 << " is " << ave << "." << endl;
return 0;
}```
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`OUTPUT:`
```
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```Enter 3 scores separated by spaces: 89
56
885
The average of 89, 56, and 885 is 343.333.
```

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Find average, Using array's and function ```

1. you could have easily generalized this to work with a vector if doubles to average the whole vector. also, you should be using a double for better precision.
#include
#include
#include
#include
typedef std::vector VD;
double average(VD vdItems) {
double sum=0;
for (uint64_t i=0; i < vdItems.size(); i++) {
sum += vdItems[i];
}
return sum/double(vdItems.size())
}
double stringtodouble(std::string s) {
double n;
std::istringstream (s)>>n;
return n;
}

int main(int argc, char * argv) {
double n;
VD elements;
argc--;argv++;
if (0==argc) {
std::cout<<"arguments should be values you wish to average. supply at least 1 argument.\n"
}
for (int i=0; i < argc; i++) {
elements[i]=stringtodouble(argv[i]);
}
std::cout<<"average="<<average(elements)<<std::endl;
return 0;
}

2. Please can you give me a code that calculates the average scores of 20 students in 15 subjects?