arrays - Adding Values of Field in C? -

i want ask how can add values of array in c. example:

array[5] -------- array[1]=0.2 array[2]=0.2 ----> want add first 0.2 second 0.2 (=0.4) array[3]=0.3 array[4]=0.15 

i want following output:

0.2 0.4 0.7 0.85 

how can that? special operators? ps: want in simple loop. not libaries etc.

much fail. many error.

tag question [c] or [c++], not both.
not same thing.

if declare array[5], valid indicies 0 through 4.
array[5] out of bounds.

you describe wanting output, program has no output!
show printf, or cout, or similar output statement.

if want add value array member, simple:

array[2] = array[2] + 0.2; 

if want add 2 array members together:

array[2] = array[1] + array[2]; 

although did not specify clearly, looks want make each member of array sum of earlier members (including itself).

here's code:

int main(void) {     double array[] = { 0.2,                        0.2,                        0.3,                        0.15                      };      for(int i=1; i<4; ++i)     {         array[i] += array[i-1];     }      for(int i=0; i<4; ++i)     {         printf("[%d] : %lf\n", i, array[i]);     }      return 0; }