Question

The following code segment which uses pointers may contain logic and syntax errors. Find and correct them.

a) Returns the sum of all the elements in summands

int sum(int* values)
{
int sum = 0;
for (int i = 0; i < sizeof(values); i++)
sum += *(values + i);
return sum;
}

b) Overwrites an input string src with "61C is awesome!" if there's room. Does nothing if there is not. Assume that length correctly represents the length of src.

void cs61c(char* src, size_t length) {
char *srcptr, replaceptr;
char replacement[16] = "61C is awesome!";
srcptr = src;
replaceptr = replacement;
if (length >= 16) {
  
for (int i = 0; i < 16; i++)
*srcptr++ = *replaceptr++;
}
}

Answer 1

1)

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

#include <stdio.h>

// We can't find the size of the array from a function.
// We have to pass the size as a parameter to the function.
int sum(int* values,int size)
{
int sum = 0;
//use the size variable here
for (int i = 0; i < size; i++)
sum += *(values + i);
return sum;
}

//testing the sum() function
int main() {
int values[5]={1,2,3,4,5};
int size = sizeof(values) / sizeof(values[0]);
   printf("%d",sum(values,size));
   return 0;
}

====================

2)

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

#include <stdio.h>
void cs61c(char* src, size_t length)
{
//change *replaceptr here
char *srcptr, *replaceptr;
char replacement[16] = "61C is awesome!";
srcptr = src;
replaceptr = replacement;
if (length >= 16)
{
for (int i = 0; i < 16; i++)
{
*srcptr++ = *(replaceptr)++;
}
  
}
}

//testing the function.
int main() {
char src[] = "PraveenKumarREDDYkumar";
   cs61c(src,24);
   printf("%s",src);
   return 0;
}

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