1. Write a while statement to test if the value of a whole number variable (called num) is greater than or equal to zero? The value of num must be decreased by one in the while test condition before the test operation is performed. Hint: Use either prefix or postfix operators. C programming 2. In C programming, construct an expression to express the following test condition: Tests that str1 is not equal to "xyz" and the length of str1 is less than or equal to 3 C programming