1.Print the string "hello world".
2.Use printf function to output 5X5 square which is consisted of + output examples:
+++++
+++++
+++++
+++++
+++++
3.Write a poem and use printf function to print it out.
4.Include header file math.h to realize the function of getting absolute value of a number.
5.Asign two integer variables a and b via the keyboard. Calculate their sum and then output the result on the screen. For example:
input: 2 5
output: 7