c - How do you store an array into a variable? -

if have array of 4 values, how store values 1 variable?

    char d[4];     int allvalues;     d[0] = 1;     d[1] = 2;     d[2] = 3;     d[3] = 4; 

i want allvalues = 1234. if add piece of code, output comes out different.

  allvalues = d;   printf("%d", allvalues); 

thank you!

allvalues = d[3] + 10 * ( d[2] + 10 * ( d[1] + 10 * d[0]));