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Using Library Functions

C. Using Library Functions. Basics. You must include the header file in your program # include < > Then use the needed function by calling it You must know the parameters and the return type. Most used headers. stdio.h string.h stdlib.h math.h graphics.h ….

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Using Library Functions

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  1. C Using Library Functions

  2. Basics • You must include the header file in your program • # include < > • Then use the needed function by calling it • You must know the parameters and the return type

  3. Most used headers • stdio.h • string.h • stdlib.h • math.h • graphics.h • …

  4. Functions in math.h • sin • cos • tan • acos • asin • atan • log • pow • …

  5. Parameter and return type • double sin (double x) • Means the parameter is double • Return type is also double • So you should write- double result, angle; angle = 45.0 * 3.14159 / 180.0; result = sin(angle);

  6. Parameter and return type • double sin (double x) • If you use int, it will not generate any error • But you may lose data • Get wrong results int result, angle; angle = 45.0 * 3.14159 / 180.0; // angle = 0 result = sin(angle); // result = 0

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