interview question

[jerico]

Hi..I recently faced this question in an interview.How to multiply a number by 7 without using multiplication operator?I could not answer it.Thanks for any reply.

jerico

[horace1]

Hi..I recently faced this question in an interview.How to multiply a number by 7 without using multiplication operator?I could not answer it.Thanks for any reply.

jerico

you could add the number 7 times, e.g. k=j*7

    k=0;
    for(int l=0; l<7; l++) k=k+j;

you could shift left 3 bits (multiply by 8) and subtract, e.g.

    j=(j<<3)-j;

[jerico]

Thanks.

jerico