# How to Fix Antiperspirant Evaporator in C

## The obstacle #

This program evaluates the life of an evaporator including a gas.

We understand the material of the evaporator (material in ml), the portion of foam or gas lost every day (evap_per_day) and the limit (limit) in portion beyond which the evaporator is no longer helpful. All numbers are strictly favorable.

The program reports the nth day (as an integer) on which the evaporator will run out usage.

Example:

`````` evaporator( 10, 10, 5) -> > 29
``````

Note:

Material remains in reality not essential in the body of the function “evaporator”, you can utilize it or not utilize it, as you want. Some individuals may choose to factor with material, some other with portions just. It depends on you however you need to keep it as a specification due to the fact that the tests have it as an argument.

## The option in C #

Choice 1:

`````` #include << math.h>>.

int evaporator( double material, double evap_per_day, double limit) {
return (int) ceil( log( threshold/100)/ log( 1 - evap_per_day/ 100));
}
``````

Choice 2:

`````` int evaporator( double material, double evap, double limit) {
anonymous brief n = 0;.
for( float lost = material * (threshold/100); material > > lost; n++).
material -= content * (evap/100);.
return n;.
}
``````

Choice 3:

`````` int evaporator( double material, double evap_per_day, double limit) {
int days;.
double portion = 100;.

for( days = 0; portion>>= limit; days++) {
portion *= (1-( evap_per_day/ 100));.
}
return days;.
}
``````

## Test cases to confirm our option #

`````` #include << criterion/criterion. h>>.

extern int evaporator( double material, double evap_per_day, double limit);.

fixed space do_test( double material, double evap_per_day, double limit, int anticipated).
{
int real = evaporator( material, evap_per_day, limit);.

cr_assert_eq( real, anticipated,.
" material = %fn".
" evap_per_day = %fn".
" limit = %fn".
" anticipated %d, however got %d",.
material, evap_per_day, limit,.
anticipated, real.
);.
}

Test( tests_suite, sample_tests).
{
do_test( 10, 10, 10, 22);.
do_test( 10, 10, 5, 29);.
do_test( 100, 5, 5, 59);.
do_test( 50, 12, 1, 37);.
do_test( 47.5, 8, 8, 31);.
do_test( 100, 1, 1, 459);.
do_test( 10, 1, 1, 459);.
do_test( 100, 1, 5, 299);.
}
``````