查找某个数组的平均值

Question

im trying to find the average coffee drank by the programmers. I can find and display the average but it just seems wrong, the way it is displayed. I just can't manage to extract the last line which displays the average.

char poste[]={'A','P','A','P','A','O','P','P','O'};
int nbCafe[]={3,5,2,1,7,1,0,3,2};
int progonly=0;
float progmoyenne=0;

for(i=0;i<9;i++){
   if (poste[i]=='P'){
       progonly+=nbCafe[i];
       progmoyenne=progonly/4.0;}
printf("%f\n",progmoyenne);}

The execution gives this.(the last line is the average coffee drank):

0.000000
0.000000
0.000000
0.000000
0.000000
0.250000
0.250000
1.000000
2.250000

Answer 1

If you just want to display the average, then just print the average. Move the printf outside the for loop.

for(i=0;i<9;i++)
{
   if (poste[i]=='P')
   {
       progonly+=nbCafe[i];
       progmoyenne=progonly/4.0;
   }
}
printf("%f\n",progmoyenne);

Answer 2

put printf outside the for loop. Also do declare i using int i;

Answer 3

Try this one:

for(cnt=i=0;i<9;i++){
    if (poste[i]=='P'){
        progonly+=nbCafe[i];
        progmoyenne=progonly/(float)++cnt;
        printf("%f\n",progmoyenne);
    }
}

Output:

$ ./a.out 
5.000000
3.000000
2.000000
2.250000