double indexLowTemp()
{ind=1;
for (a=0;a<col;a++)
 {if (low<=temp[a][0])
	{low=temp[a][0];
	 ind=a;
	}
 }

what is the problem with that piece of code??

Perhaps ...

double indexLowTemp()
{ind=1;
for (a=0;a<col;a++)
 {if (low<=temp[a][0])
	{low=temp[a][0];
	 ind=a;
	}
 }

// output low temp ...
cout << low;
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