#include <iostream>
using namespace std;
 
int main()
{
setlocale (0,"rus");
const int s=7,c=5;
int i,j;
double m[s][c],a=0;
bool neg[s];
 
cout<<"Введите числа"<<endl;
for (i=0;i<s;i++)
{
    cout<<"строка под номером: "<<i<<endl;
    neg[i] = false;
    for (j=0;j<c;j++)
    {
        cin>>m[i][j];
        if( m[i][j]<0 ) neg[i] = true;
    }
}
 
for (i=0;i<s;i++)
{
    if( neg[i] )
    {
        double sum = 0;
        for (j=0;j<c;j++)
        {
            sum += m[i][j];
        }
        cout<<"сумма элементов "<<i<<" строки = "<<sum<<endl;
    }
}
 
return 0;
}

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1 2 3 4 5 
1 -2 3 4 5 
1 2 3 4 5 
1 2 3 -4 5 
1 2 3 4 5 
1 2 3 4 5 
1 2 3 4 -5