Exercises

3.1 What does program repetition mean? Describe the operation of for, while and do – while loops in C.

3.2 Write a program to calculate the sum of numbers from 1 to 10 and send the result to PORT C of a PIC microcontroller.

3.3 Write a function to calculate the squares of numbers between 1 and 10 and store the results in an array passed as a function parameter.

3.4 What can you say about the following while loop?

3.5 Write a program to calculate the sum of even numbers between 0 and 100.

3.6 Write a function to calculate the volume of a cube. Show how this function can be called from a main program.

3.7 Write a function to convert inches to centimetres. Show how this function can be called from a main program to convert 12 inches to centimetres.

3.8 Write a function to add two vectors of dimensions 15, passed as parameters to the function.

3.9 Write two functions to convert temperature from Fahrenheit to Celsius and vice-versa. Show how the two functions can be combined.

3.10 Find the errors in the following program:

3.11 What is an array? How are arrays defined? Write example statements to define an array of 50 integers.

3.12 Using a for loop, write a program to initialise the elements of an array to 1. Assume that the array dimension is 30.

3.13 How is the text string ‘Computer’ represented in C? Describe different ways of declaring this string in a program.

3.14 Write a function to receive a string and then to convert first the character of this string to uppercase.

3.15 Write a function to check whether or not the first character of a string is uppercase. Return 1 if it is upper case, otherwise return 0.

3.16 Write a function to calculate the number of spaces in a character string and return this number as an integer.

3.17 Write a function to join two strings whose addresses are supplied as function parameters.

3.18 What is wrong with the following code?

3.19 Re-write the following expressions in a different way, to remove the logical NOT:

3.20 Write the equivalent if-else statements for the following tests:

3.21 What is a void function? Describe with an example.

3.22 What is a function prototype? Describe with an example.

3.23 How would you use the sizeof operator to calculate the storage requirements of a structure? Give an example.

3.24 What will be the value of variable Total in the following example?

3.25 What will be the value of variables x and y after the following expressions are executed?

3.26 Given that ptr is a pointer to an integer variable, what are the results of the following expressions?