Question 28 To pass a onedimensional array by reference you

Question 28

To pass a one-dimensional array by reference, you __________.

must include the address-of (&) operator before the array\'s name

must include the number symbol (#) before the array\'s name

do not have to do anything because arrays are automatically passed by reference

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Question 29

Assuming that the message variable contains the string \"Happy holidays\",

the statement

message.find(\"days\");

returns _________________.

-1

10

11

day

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Question 30

A _____________ is a single item of information about a person, place, or thing.

data file

field

program file

record

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Question 31

How many values can a variable contain at any time?

1

2

3

infinite number

Solution

1) To pass a one-dimensional array by reference, you do not have to do anything because arrays are automatically passed by reference.

For example :

#include <iostream>

float sum(float age[]);

int main() {
   float s, age[] = { 23.4, 55, 22.6, 3, 40.5, 18 };
s = sum(age); /* Only name of array is passed as argument. */
printf(\"Sum of age=%.2f\", s);
return 0;
}

float sum(float age[])
{
int i;
float sum = 0.0;
for (i = 0; i < 6; ++i) {
sum += age[i];
}
return sum;
}

2) Assuming that the message variable contains the string \"Happy holidays\", the statement message.find(\"days\");

returns 10.

It returns the position where it finds the substring(the leftmost character position is numbered 0).

3) A field is a single item of information about a person, place, or thing.

4) How many values can a variable contain at any time? 1

At a time instance a primitive data type variable (like int, char) can store only one value. Arrays or other data structures can store more than one.