Question

T/F C Language Questions. Answer the following true/false questions. You must correctly state WHY your answer is true or false in order to receive credit.

#include <stdio.h>

#include <string.h>

int run_through(int num, char **a)

{

int i;

int check=0;

for(i=0;i<num;i++)

{

printf("%s\n", *(a+i));

if(strcmp(*(a+i), "filename")==0)

{

check=1;

}

}

return check;

}

char** find_filename(int n, char **b)

{

int i;

int check=0;

for(i=0;i<n;i++)

{

if(strcmp(*b, "filename")==0)

{

b++;

break;

}

b++;

}

return b;

}

int main(int argc, char **argv)

{

int choice;

char **hold;

if(!(argc<6))

{

printf("Not happening.\n");

}

else

{

choice=run_through(argc, argv);

if(choice==0)

{

printf("Here.\n");

}

else

{

hold=find_filename(argc, argv);

printf("The filename is %s!\n", *hold);

}

}

}

1. Only one of the parameters of main is passed as an argument.
2. A command line like the following would cause the function find_filename to execute: ./a.out file 2 3
3. In the function run_through, the value of a changes during the duration of the function.
4. All functions shown above have the same parameter types.
5. If Here. is printed to screen the value of hold must be at least 6.
6. The loop in the function find_filename will always execute the same number of times as argc.
7. In the final else statement in main, *hold prints out an address since hold is of type char**.
8. The function run_through always returns a value that can also be found in argv.
9. In find_filename, the value of b is always the same.
10. A command line like the following would mean that choice equals 0: ./a.out name file string 3 4 9 stuff again

Answer 1

1. false

(int argc, char **argv)

basically, argc is refering the muliple argument passed in, which includes the actual name of the program, as invoked by the user. argv contains the actual arguments, starting with index 1. Index 0 is the program name.

2. true

strcmp(*b, "filename") in that of C programming the function is used for the compare of two string.

if the both are same input given by then it will be true else false.

3 true

in every input or given the other argument the result will be change

if(strcmp(*(a+i), "filename")==0) that will be providing the status 1 or 0.

4. false

every function of argument are not same type

In C, a char**b means pointer to a pointer to b.

argc is refering the muliple argument passed in, which includes the actual name of the program, as invoked by the user. argv contains the actual arguments, starting with index 1. Index 0 is the program name

5. true

for e,g;

int main(int argc, char *argv[])
{
    printf("%d\n",argc);
    printf("%s\n",argv[0]);
    printf("%s\n",argv[1]);
    printf("%s\n",argv[2]);
    return 0;
}

6. false

no depends upon the number of argument . because n will the integer which will pass the user. and char **b be the pointer of pointer of b. which hold the prevoius value of char.

7.true

it will hold the address of hold

for e,g

char *p1="ABCD";
p1="EFG";
printf ("%s",p1);

8.false

because argv[] is a pointer array which points to each argument passed to the program.argv[0] holds the name of the program itself and argv[1] is a pointer to the first command line argument supplied, and *argv[n] is the last argument. If no arguments are supplied, argc will be one, and if you pass one argument then argc is set at 2.

9.false

No , it will be change for pointer of holds the prevoius address.

10.true

./a.out name file executes on the equal choice 0 is.

excutes of file name like  ./a.out name file here.