CMSC 104

Recursion & arrays Problem Set

1.) Write a recursive function power (base, exponent) that when invoked returns

exponent base

For example, power(3,4) = 3 * 3 * 3 * 3

Assume that exponent is an integer greater than or equal to 1. Hint: the recursion step would use the relationship

exponent ( exponent - 1 ) base = base * base

and terminating condition occurs when exponent is equal to 1 because

1 base = base

2.) Write C statements to accomplish each of the following:

Display the value of the seventh element of character array f.

Input a value into element 4 of single-subscripted floating-point array b.

Initialize each of the 5 elements of single-subscripted integer array g to 8.

Total the elements of floating-point array c of 100 elements.

Copy array a into the first portion of array b Assume float a[11], b[34];

Determine and print the smallest and largest values contained in 99-element floating point array w.

3.) Write single statements that perform each of the following single subscripted array operations:

Initialize the 10 elements of the integer array counts to zeros.

Add 1 to each of the 15 elements of integer array bonus.

Read the 12 values of floating point array monthlyTemperatures from the keyboard.

Print the 5 values of integer array bestScores in column format.

4.) Find the error(s) in each of the following statements:

a.) char str[5]; scanf("%s", str); /* user prints hello */ b.) int a[3]; printf("$d %d %d\n", a[1], a[2], a[3]); c.) float f[3] = { 1.1, 10.01, 100.01, 1000.111 }; d.) double d[2][10]; d[1,9] = 2.345;

5.) What does the following program do?

#include <stdio.h> #define SIZE 10 int whatIsThis(Int [ ], int); main() { int total, a[SIZE] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; total = whatIsThis(a, SIZE); printf("Total of array elemnt values is %d\n", total); return 0; } int whatIsThis( int b[ ], int size ) { if (size = = 1) { return b[0]; } else { return b[size - 1] + whatIsThis(b, size - 1); } }