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CS1010E Tutorial 2 Q5: Function Implementation and Data Type Conversion

This tutorial focuses on the implementation of two functions in C: `integerAdd` and `doubleAdd`. It demonstrates how to use these functions in the main program to perform addition on integers and doubles. The program includes preprocessing directives and variable declarations, storing results of both function calls to display the differences in data types. Key pointers are highlighted regarding automatic data type conversion, potential precision loss, and naming conflicts across functions. Overall, it emphasizes understanding functions and type compatibility within C programming.

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CS1010E Tutorial 2 Q5: Function Implementation and Data Type Conversion

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  1. CS1010E Tutorial 2 Q5. Using function, // This is Q5. // Include preprocessing directive. #include <stdio.h> intintegerAdd (int x, int y); //Function Prototype for part A. double doubleAdd (double x, double y); //Function Prototype for part B. // This programme prints the answer to q5a and q5b. int main (void) { // Declare variable used, where result1 is part1 and result2 is part2. int result1; double result2;

  2. CS1010E Tutorial 2 Q5. //Store the computation in different data type compared to the function. result1 = doubleAdd (4.7,5.5); result2 = integerAdd (4.75,5.25); // Display the end results from the data type conversion. printf("result1 = %d\nresult2 = %lf\n", result1, result2); return 0; } intintegerAdd (int x, int y) { return x+y; } double doubleAdd (double x, double y) { return x+y; } • result1 = 10 • result2 = 9.000000

  3. CS1010E Tutorial 2 Q5. CS1010E Tutorial 2 Q5. Using tracking (part a), main doubleAdd (double x, double y) : : int result; result = doubleAdd (4.7,5.5); ( result ) : : return x+y; (x ) (y ) ( return ) 4.7 5.5 10 10.2

  4. CS1010E Tutorial 2 Q5. Using tracking (part b), main integerAdd (int x, int y) : : double result; result = integerAdd (4.75,5.25); ( result ) : : return x+y; (x ) (y ) ( return ) 4 5 9 9.000000

  5. CS1010E Tutorial 2 Q5. • Key pointers • Data type conversion will occur automatically when argument  input parameter (i.e when 4.75  4 in part b) • Data type conversion will occur automatically when return value  assignment statement (i.e when 10.2  10 in part a) • Precision of result may decreases during the conversion.

  6. CS1010E Tutorial 2 Q5. • Additional pointer • No conflict in variable names from function to function.

  7. CS1010E Tutorial 2 Q5. Using function, // This is Q5. // Include preprocessing directive. #include <stdio.h> intintegerAdd (intx, inty); //Function Prototype for part A. double doubleAdd (double x, double y); //Function Prototype for part B. // This programme prints the answer to q5a and q5b. int main (void) { // Declare variable used, where result1 is part1 and result2 is part2. int result1; double result2;

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