[ganselo]

Код:

#include <math.h>
int main()
{
   float a[3][3] = {{0.5,3.2,7.1},{0,-2.1,3.5},{0.8,2.5,-1.5}};
   for(int i = 0; i < 3; i++)
       a[i][i] = fabs(a[i][i]);
   return 0;
}