QString str1 = "1234.56"; double val = str1.toFloat(); // val == 1234.56
Here is what the above code is Doing:
1. The first line creates a QString object called str1 and initializes it with the string “1234.56”.
2. The second line converts the string to a double and stores the result in the variable val.
3. The third line prints the value of val to the console.