Question

C-coding

Question1:

Fill in the function body for the provided sum() function such that the call sum(g, i, j) returns the value of the calculation:



Note:
For the case where j < i, the function sum() should return 0.

#include <stdio.h>

int g(int val)

{

return val * val;

}

int sum(int (*f)(int val), int start, int end)

{

/* Your code goes here */

}

int main()

{

printf("Result: %d\n", sum(g, 10, 20));

return 0;

}

******************************************************

Question 2:

Fill in the function body for do_file_menu() such that, when given a string as an argument, the function searches the given array of structures for a matching command name and then calls the function associated with that name.

You will know your solution is working properly when you achieve the following output:

Created New File.

Opened File.

Closed File.

File Saved.

Printing File...

Goodbye.

#include <stdio.h>

#include <string.h>

struct menu {

char *cmd_name;

void (*cmd_ptr)(void);

};

void file_new()

{

printf("Created New File.\n");

}

void file_open()

{

printf("Opened File.\n");

}

void file_close()

{

printf("Closed File.\n");

}

void file_save()

{

printf("File Saved.\n");

}

void file_print()

{

printf("Printing File...\n");

}

void file_exit()

{

printf("Goodbye.\n");

}

/* global variable 'file': array of structs */

struct menu file[] = {

{"new", file_new}, /* file[0] */

{"open", file_open}, /* file[1] */

{"close", file_close}, /* file[2] */

{"save", file_save},

{"print", file_print},

{"exit", file_exit} /* file[5] */

};

void do_file_menu(char *name)

{

/* Your code goes here. */

}

int main()

{

int i;

/* array of char pointers to string literals */

char *test[] = {

"new",

"open",

"close",

"save",

"print",

"exit"

};

/* test all of the commands one by one */

for (i=0; i<sizeof(test)/sizeof(*test); i++)

do_file_menu(test[i]);

return 0;

}

Answer 1

Here is the solution to above problem in C. Please read the code comments for more information

PLEASE GIVE A THUMBS UP!!!

QUESTION 1.

C Code

#include <stdio.h>

int g(int val)
{
return val * val;
}

int sum(int (*f)(int val), int start, int end)
{
//end is less than i return 0
if(end<start)
   return 0;
int S=0; //to store sum
int i;
//you need to call the function g here with
//iterate from start to end
for( i=start;i<=end;++i)
{
   S+=(*f)(i);
}
return S;
}

int main()
{
printf("Result: %d\n", sum(g, 10, 20));
return 0;

}

Screenshot of output

QUESTION 2

C Code

#include <stdio.h>
#include <string.h>

struct menu {

char *cmd_name;

void (*cmd_ptr)(void);

};

void file_new()

{

printf("Created New File.\n");

}

void file_open()

{

printf("Opened File.\n");

}

void file_close()

{

printf("Closed File.\n");

}

void file_save()

{

printf("File Saved.\n");

}

void file_print()

{

printf("Printing File...\n");

}

void file_exit()

{

printf("Goodbye.\n");

}

/* global variable 'file': array of structs */

struct menu file[] = {

{"new", file_new}, /* file[0] */

{"open", file_open}, /* file[1] */

{"close", file_close}, /* file[2] */

{"save", file_save},

{"print", file_print},

{"exit", file_exit} /* file[5] */

};

void do_file_menu(char *name)

{

//match the corresponding string and print from the array
//and add the corresponding function
//strcmp function returns 0 if two string are same
//use if else to check for all the cases
if(strcmp(name,"new")==0)
   file_new();
else if(strcmp(name,"open")==0)
   file_open();
else if(strcmp(name,"close")==0)
   file_close();
else if(strcmp(name,"save")==0)
   file_save();
else if(strcmp(name,"print")==0)
   file_print();
else if(strcmp(name,"exit")==0)
   file_exit();

}

int main()

{

int i;

/* array of char pointers to string literals */

char *test[] = {

"new",

"open",

"close",

"save",

"print",

"exit"

};

/* test all of the commands one by one */

for (i=0; i<sizeof(test)/sizeof(*test); i++)

do_file_menu(test[i]);

return 0;

}

Screenshot of output