Lab 9 sem ii_12_13


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Lab 9 sem ii_12_13

  1. 1. UNIVERSITI TUN HUSSEIN ONN MALAYSIA FACULTY OF MECHANICAL AND MANUFACTURING ENGINEERING BTI 10202: COMPUTER PROGRAMMING LAB 9 : Functions NAME : _____________________________________ MATRICS NO.: _______________ DATE : ____________ MARKObjective: Introduce to the usage of a function, types of function and functionTheory: 1. A function is a section of program that perform specific task. For an example; in real life, a big project is split into sub project (e.g: contactor manage subcontract to finish a building). The same method can be used to segregate certain task in programming. a. Main function: to call sub function accordingly b. Sub function one: to receive information and calculate c. Sub function to : to display the result 2. Function definition: consist of two parts: a. Function header: divided into three parts: Prototypes declaration example: Return_type function_name (parameters_list); i. A return type • Similar to variable type: int (round number), char (letter and strings), float/double (decimal numbers), void (no returning value). ii. A function name • Use easy to understand sub function name that complies with the syntax rules iii. Parameter lists • The list of data for communication purpose with the calling functions. If there is no data to be use, the keyword void is use. b. Function body normally contains: i. Local declaration ii. Local definition iii. Return expression (this does not apply to function without any returning value) 3. Function call is a postfix expression to call a sub functions/how to call function from any functions: Example: printf(“The result is %d”, add(a,b)); //a function can be call from printf display();//direct instruction to jump to the sub function total=add(a,b); //assigning sub function add to total
  2. 2. Exercise 1: type the coding below and answer the following questions: 1 #include<stdio.h> 2 #include<conio.h> 3 4 int fnAdd(int iValue1, int iValue2); 5 6 int main() { 7 int iResult,iValue1=8, iValue2=9; 8 9 iResult = fnAdd(iValue1, iValue2); 10 printf("Sum of %d and %d is %dn",iValue1, iValue2, iResult); 11 getch(); 12 return 0; } 13 14 int fnAdd(int iValue1, int iValue2) 15 { 16 int iSum; 17 iSum = iValue1 + iValue2; 18 return (iSum); }i. What is the output of the coding? Output:ii. Change line 4 with int fnAdd(int iNum1, int iNum2) ; line 14 with int fnAdd(int iNum1, int iNum2) and line 17 iSum = iNum1 + iNum2; Compile and run the coding. Explain how this change affects the output. Output: _____________________________________________________________________ _____________________________________________________________________iii. Revert to original coding. Remove coding in line 9 Change line 10 with printf("Sum of %d and %d is %dn",iValue1, iValue2, fnAdd(iValue1, iValue2)); Compile and run the coding. Explain how this change affects the output. Output: Explains what you learn: _____________________________________________________________________ _____________________________________________________________________iv. Change line 7 with float iResult,iValue1=8, iValue2=9;
  3. 3. List the error and explains: _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________v. Revert to original coding. Change line 14 with int fnAdd(inum1, inum2) List the error and explains: