Reading symbols from ./qzz...done.
(gdb) br main
Breakpoint 1 at 0x1004010f7: file qzz.cpp, line 8.
(gdb) r
Starting program: /tmp/qzz
[New Thread 16100.0x1444]
[New Thread 16100.0x4a5c]
[New Thread 16100.0x454c]
[New Thread 16100.0x3824]

Breakpoint 1, main () at qzz.cpp:8
8               const char *val = "73.31";
(gdb) n
9               std::stringstream ss;
(gdb)
10              ss << val;
(gdb)
11              float floatVal = 0.0f;
(gdb)
12              ss >> floatVal;
(gdb)
13              std::cout << std::setw(18) << std::setprecision(15) << floatVal << std::endl;
(gdb) p floatVal
$1 = 73.3099976
(gdb) n
  73.3099975585938
15              floatVal = atof(val);
(gdb)
16              std::cout << std::setw(18) << std::setprecision(15) << floatVal << std::endl;
(gdb) p floatVal
$2 = 73.3099976
(gdb) n
  73.3099975585938
17      }
(gdb)