Question 6 (a) The C function int strlen (char stringl]); returns the length of

Question

Question 6 (a) The C function int strlen (char stringl]); returns the length of a null-terminated string. i. What is a null-terminated string? [2 marks] ii. Write an implementation of the strlen function. [5 marks)] (b) Write a C function with signature void multiScalar(int AL 1 [5], int rows, int factor); that multiplies a rows × 5 matrix A by a scalar factor (c) Explain what void means in the C function signature (d) main is making 3 calls to the function multiScalar as shown below (6 marks] [2 marks] int main ) int int int factor [3] [5]- 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}; new [4] [5]; x=2; multiScalar(factor, 3, x); multiscalar(neu, 4, 5); multiScalar(factor, 4, 4); For each call, will that line compile or generate an error? If it compiles, briefly explain the outcome of that call [9 marks] [Total for Question 6: 24 marks]

Explanation / Answer

Qa)

The null terminated string is a character array which ends with the character ''

The implementation will be

int strlen(char arr[])

{

int i=0;

while(arr[i++]);

return i;

}

Q2

The code will be

void multiScalar(int arr[][5],int rows,int factor)
{
int i,j;
for(i=0;i<rows;i++)
for(j=0;j<5;j++)
arr[i][j]*=factor;
}

Q3

void means that the function is not returning anything

Q4

It will not generate any error and will multiply the array with the third value provided

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