Answer:
b(ii) prices[1]= 20.50; // do not declare with double again
b (iii) scanf("%lf", &prices[4]); //prices[4] is last element
d) See below
Step-by-step explanation:
/* This program uses the string.h header file
The strncat() function in this file concatenates two strings. It takes three arguments, dest and source strings and number of characters to concatenate
*/
#include <stdio.h>
#include <string.h>
int main() {
char s1[10] = "Happy";
char s2[10] = " Birthday";
char s3[10]="";
strncat(s3, s1, 5); //concatenate 5 characters of s1 to end of s3 and
//store result in s3; s = "Happy"
strncat(s3, s2, 10); //concatenate s2 with current contents of s3
//s3 becomes "Happy Birthday
printf("%s", s3);
return 0;
}