Question

Write the full C program which implements the operations given below using pointers. • Define an array of integers (x array). • The size of the array will be 100. • x values will be randomly determined between 1 and 20. • Set the seed of the random number generator to the system time. • Define the external function => y = x2 + 3x + 5 • Calculate and save the results (y values) of the function to another array. • Sort x-y pairs with respect to x values. • Save x-y pairs to a sequential file.

Answer 1

Solution:
Look at the ode and comments for better understanding...............

Screenshot of the code:

-/QA/c/solution.c.- Sublime Text (UNREGISTERED) Project Preferences Help File Edit Selection Find View Goto Tools solution.c 1 2 #include<stdio.h> #include<stdlib.h> #include<time.h> //function that returns tha value of y corresponding to x int y(int x){ return (x*x)+(3*x)+5; 4 5 6 } 8 9 11 14 15 16 int main() { //Defining x_array and y_array of size 100 int *x_array=(int *)malloc(sizeof(int)*100); int *y_array=(int *)malloc(sizeof(int)*100); //seeding the rand() function with time srand(time()); //placing values in x_array for(int i=0;i<100;i++){ //generating a random number between 1 and 20 *(x_array+i)=(rand()*20)+1; 1/placing values in y_array for(int i=0;i<100;i++){ *(y_array+i)=y(*(x_array+i)); } 18 19 20 //Writing to a file //I am writin the value of x and y (x,y) but you can use the format you like FILE *fp=fopen("output.txt", "W"); for(int i=0;i<100; i++) { fprintf(fp,"%d,$d) ",*(x_array+i),*(y_array+i)); fclose(fp); 30 31 } Line 4, Column 58 Tab Size: 4 C

Output:

I am writing the results to a file output.txt you can use the name of your own

gm@Tricia: -/QA/C File Edit View Search Terminal Help gm@Tricia:-/QA/c$ gcc solution.c gm@Tricia:-/QA/c$ ./a.out gm@Tricia:-/QA/c$ cat output.txt (6,59) (13,213) (4,33) (8,93) (2,15) (6,59) (14,243) (15,275) (2,15) (16,309) (10,135) (8,93) (17,345) (1,9) (6,59) (5, 45) (5,45) (11,159) (6,59) (13,213) (1,9) (4,33) (17,345) (6,59) (9,113) (12,185) (10,135) (11,15 9) (7,75) (10,135) (19,423) (12,185) (14,243) (2,15) (12,185) (15,275) (8,93) (5,45) (2,15) (9,113) (12,185) (11,159) (9,113) (9,113) (11,159) (14,243) (13,213) (8,93) (17,345) (10,135) (20,465) (17,345) (6,59) (16,3 09) (14,243) (14,243) (20,465) (3,23) (5,45) (6,59) (4,33) (3,23) (9,113) (10,135) (17,345) (20,465) (16,309 ) (4,33) (4,33) (17,345) (4,33) (8,93) (20,465) (4,33) (16,309) (10,135) (18,383) (20,465) (17,345) (14,243) (2,15) (17,345) (2,15) (7,75) (4,33) (7,75) (12, 185) (3,23) (9,113) (16,309) (20,465) (5, 45) (11,159) (9, 11 3) (14,243) (19,423) (8,93) (9,113) (14,243) (4,33) gm@Tricia:-/QA/c$

Code:

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
//function that returns tha value of y corresponding to x
int y(int x){
        return (x*x)+(3*x)+5;
}
int main(){
        //Defining x_array and y_array of size 100
        int *x_array=(int *)malloc(sizeof(int)*100);
        int *y_array=(int *)malloc(sizeof(int)*100);
        //seeding the rand() function with time
        srand(time(0));
        //placing values in x_array
        for(int i=0;i<100;i++){
                //generating a random number between 1 and 20
                *(x_array+i)=(rand()%20)+1;
        }
        //placing values in y_array
        for(int i=0;i<100;i++){
                *(y_array+i)=y(*(x_array+i));
        }

        //Writing to a file
        //I am writin the value of x and y (x,y) but you can use the format you like
        FILE *fp=fopen("output.txt","w");
        for(int i=0;i<100;i++){
                fprintf(fp,"(%d,%d) ",*(x_array+i),*(y_array+i));
        }
        fclose(fp);
}

I hope this would help you..........................:-))

Please provide feedback...................:-))