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To find angle between two vectors in degree

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/* To find angle between two vectors */
#include<stdio.h>
#include<math.h>
int main()
{
    float ax, ay, az, bx, by, bz, AdotB, ModA, ModB, ModAModB, AngleAB;
    printf("Enter the values of ax, ay, az:\n");
    scanf("%f%f%f", &ax, &ay, &az);
    printf("A=(%f)i+(%f)j+(%f)k", ax, ay, az);
    printf("\nEnter the values of bx, by, bz:\n");
    scanf("%f%f%f", &bx, &by, &bz);
    printf("B=(%f)i+(%f)j+(%f)k", bx, by,bz);
    AdotB=ax*bx+ay*by+az*bz;
    printf("\nA.B=%f", AdotB);
    ModA=sqrt(ax*ax+ay*ay+az*az);
    ModB=sqrt(bx*bx+by*by+bz*bz);
    ModAModB=ModA*ModB;
    AngleAB=AdotB/ModAModB;
    AngleAB=AngleAB*180/3.14159;
    printf("\nAngle between A and B in degree is  Cos/_A,B=%f\n", AngleAB);
    return(0);
}
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