64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
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//
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// Chpater 03 program 3: Ch_03_03.cpp
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// Type coercion - implicit and explicit, mixed data type statements
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#include <iostream>
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using namespace std;
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int main()
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{
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int num1 = 50; // variable used in coercion equations
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int num; // variable to hold coerced values
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float flt1 = 3.14159; // variable used in coercion equations
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float flt; // variable to hold coerced values
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// If you want to coerce a number from one data type
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// to another, show it by using type casting. do not let
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// the computer do it automatically by using implicit type coercion
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// implicit type coercion - conversion is done automatically
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cout << "Implicit type coercion of integer to float and float to an int.i\n";
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num = flt1;
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flt = num1;
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cout << "int num contains the value for 3.14159: " << num << endl;
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cout << "float flt contains the value for 50: " << flt << endl;
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cout << "***********************************\n\n";
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// explicit type coercion - type casting
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// here num1 is converted to a float before the multiplication,
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// then the overall result is converted to an integer.
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cout << "Explicit type coercion of int to a float and a float to an int\n";
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num = int(flt1*float(num1));
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cout << "type cast value for num: " << num << endl;
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cout << "calculated float value: " << flt1*num1 << endl;
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cout << "***********************************\n\n";
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// in this statement, flt1 is converted to an integer to
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// perform integer division, and then the result is made a float
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cout << "integer division result converted to a float\n";
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flt = float(num1/int(flt1));
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cout << "calculated integer value: " << num1/int(flt1) << endl;
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cout << "type cast value for flt: " << flt << endl;
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cout << "***********************************\n\n";
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// mixed data type statements
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// illustration of floating point arithmetic with implicit coercion from int to float
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cout << "Mixed expressions output\n";
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cout << "Value of 3.0/2 + 0.75 = " << 3.0/2 + 0.75 << endl;
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// Illustration of integer division followed by implicit coercion to a float
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flt1 = 100/40*1.0;
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cout << "Value of 100/40*1.0 = " << flt1 << endl;
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flt1 = 1.0*100/40;
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cout << "Value of 1.0*100/40 = " << flt1 << endl;
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flt1 = float(num1/13); // integer division typecast to float
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cout << "float(num1/13) = " << flt1 << endl;
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flt1 = float(num1)/13; // integer division typecast to float
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cout << "float(num1)/13 = " << flt1 << endl;
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return 0;
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}
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