Array is showing different output in C

Question

Here is a code in C language I got stuck.

#include<stdio.h>

int main(){
    int Force_V[2], w;
    int i, j, Disp_V[2];
    printf("Enter Force Vector: ");
    for(i=0; i<=2; i++){
        scanf("%d", &Force_V[i]);
    }
    printf("Enter Displacement Vector: ");
    for(j=0; j<=2; j++){
        scanf("%d", &Disp_V[j]);
    }
    printf("Force vector: %di+%dj+%dk", Force_V[0],Force_V[1],Force_V[2]);
    printf("\nDisplacement vector== %di+%dj+%dk", Disp_V[0],Disp_V[1],Disp_V[2]);

    w= (Force_V[0]*Disp_V[0])+(Force_V[1]*Disp_V[1])+(Force_V[2]*Disp_V[2]);

    printf("The work: %df", w);

    return 0;

}

output for Force_V[2] is showing the output of Disp_V[0]. Can anyone tell me where's the error?

Since you seem to be using 3D vectors, the arrays need to be of size 3, not 2. Your loops should be for (int i = 0; i < 3; i++) — this is the idiomatic form for a loop over an array of three elements. — Jonathan Leffler
– Jonathan Leffler, Commented Nov 8, 2020 at 4:04

BattleTested_закалённый в бою · Accepted Answer · 2020-11-08 04:01:24Z

1

The array int Force_V[2] has two cells so you must change your loop condition like this :

for(i=0; i<2; i++)

answered Nov 8, 2020 at 4:01

BattleTested_закалённый в бою

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Comments

Jasmeet · Accepted Answer · 2020-11-08 04:04:52Z

1

Note that C does not have strict array index checking. You declared the arrays int Force_V[2] which denotes that it has two integer memory location indexed 0 and 1. Further on you try to set and access the memory using index 2, which might be used by some other variable. In your case it is being referred by Disp_V, but usually this gives undefiined behaviuor.

#include<stdio.h>


int main(){
    int Force_V[3], w;
    int i, j, Disp_V[3];
    printf("Enter Force Vector: ");
    for(i=0; i<3; i++){
        scanf("%d", &Force_V[i]);
    }
    printf("Enter Displacement Vector: ");
    for(j=0; j<3; j++){
        scanf("%d", &Disp_V[j]);
    }
    printf("Force vector: %di+%dj+%dk", Force_V[0],Force_V[1],Force_V[2]);
    printf("\nDisplacement vector== %di+%dj+%dk", Disp_V[0],Disp_V[1],Disp_V[2]);

    w= (Force_V[0]*Disp_V[0])+(Force_V[1]*Disp_V[1])+(Force_V[2]*Disp_V[2]);

    printf("The work: %df", w);

    return 0;

}

edited Nov 8, 2020 at 4:04

answered Nov 8, 2020 at 4:01

Jasmeet

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1 Comment

Jonathan Leffler Over a year ago

It's better in C (more idiomatic C) to use for (int i = 0; i < 3; i++) to loop over the elements of an array with 3 elements.

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