// cumulative product example
//
#include <stdio.h>

int main( void)
{
  double i, prod;

  i = 1; prod = 1;   

  while( i <= 100)  
  {
    prod *= i;  // same as: prod = prod * i;

    printf( "%g %g\n", i, prod );     

    ++i;  // same as: i = i + 1;            
  }

  return 0;
}

/* output:

1 1
2 2
3 6
4 24
5 120
6 720
7 5040
8 40320
9 362880
10 3.6288e+06
11 3.99168e+07
12 4.79002e+08
13 6.22702e+09
14 8.71783e+10
15 1.30767e+12
16 2.09228e+13
17 3.55687e+14
18 6.40237e+15
19 1.21645e+17
20 2.4329e+18
21 5.10909e+19
22 1.124e+21
23 2.5852e+22
24 6.20448e+23
25 1.55112e+25
26 4.03291e+26
27 1.08889e+28
28 3.04888e+29
29 8.84176e+30
30 2.65253e+32
31 8.22284e+33
32 2.63131e+35
33 8.68332e+36
34 2.95233e+38
35 1.03331e+40
36 3.71993e+41
37 1.37638e+43
38 5.23023e+44
39 2.03979e+46
40 8.15915e+47
41 3.34525e+49
42 1.40501e+51
43 6.04153e+52
44 2.65827e+54
45 1.19622e+56
46 5.50262e+57
47 2.58623e+59
48 1.24139e+61
49 6.08282e+62
50 3.04141e+64
51 1.55112e+66
52 8.06582e+67
53 4.27488e+69
54 2.30844e+71
55 1.26964e+73
56 7.10999e+74
57 4.05269e+76
58 2.35056e+78
59 1.38683e+80
60 8.32099e+81
61 5.0758e+83
62 3.147e+85
63 1.98261e+87
64 1.26887e+89
65 8.24765e+90
66 5.44345e+92
67 3.64711e+94
68 2.48004e+96
69 1.71122e+98
70 1.19786e+100
71 8.50479e+101
72 6.12345e+103
73 4.47012e+105
74 3.30789e+107
75 2.48091e+109
76 1.88549e+111
77 1.45183e+113
78 1.13243e+115
79 8.94618e+116
80 7.15695e+118
81 5.79713e+120
82 4.75364e+122
83 3.94552e+124
84 3.31424e+126
85 2.8171e+128
86 2.42271e+130
87 2.10776e+132
88 1.85483e+134
89 1.6508e+136
90 1.48572e+138
91 1.352e+140
92 1.24384e+142
93 1.15677e+144
94 1.08737e+146
95 1.033e+148
96 9.91678e+149
97 9.61928e+151
98 9.42689e+153
99 9.33262e+155
100 9.33262e+157

*/