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#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <ctype.h> | |
#include <assert.h> | |
//USING C98 standard | |
const float PI = 3.14; | |
int my_abs(int x) { | |
if (x >= 0) return x; | |
else return -x; | |
} | |
float my_circle_area(float r) { | |
return PI * r * r; | |
} | |
float my_cylinder_volume(float r, float h) { | |
return h * my_circle_area(r); | |
} | |
void lower_to_upper(char* s) { | |
for (int i = strlen(s) - 1; i >= 0; i--) | |
s[i] = toupper(s[i]); | |
return; | |
} | |
void change(char* s) { | |
for (int i = strlen(s) - 1; i >= 0; i--) | |
switch(s[i]) { | |
case 'A': case 'a': | |
case 'B': case 'b': | |
case 'C': case 'c': | |
s[i] = 'X'; | |
break; | |
case 'D': case 'd': | |
case 'E': case 'e': | |
case 'F': case 'f': | |
s[i] = 'Y'; | |
break; | |
} | |
return; | |
} | |
long fac(int n) { | |
if (n <= 1) return 1; | |
return n * fac(n - 1); | |
} | |
int main() | |
{ | |
// tests | |
assert(my_abs(-6) == 6); | |
assert(my_abs(6) == 6); | |
assert(my_abs(0) == 0); | |
assert(fac(0) == 1); | |
assert(fac(1) == 1); | |
assert(fac(2) == 2); | |
assert(fac(3) == 6); | |
assert(fac(4) == 24); | |
assert(my_circle_area(0) == 0); | |
assert(my_circle_area(-1) == PI); | |
assert(my_circle_area(1) == PI); | |
assert(my_circle_area(2) == 4 * PI); | |
assert(my_cylinder_volume(0, 0) == 0); | |
assert(my_cylinder_volume(1, 2) == 2 * PI); | |
assert(my_cylinder_volume(2, 2) == 8 * PI); | |
char s1[] = ""; | |
lower_to_upper(s1); | |
assert(strcmp(s1, "") == 0); | |
char s2[] = "ASDFasdf"; | |
lower_to_upper(s2); | |
assert(strcmp(s2, "ASDFASDF") == 0); | |
char s3[] = ""; | |
change(s3); | |
assert(strcmp(s3, "") == 0); | |
char s4[] = "ASDFasdf"; | |
change(s4); | |
assert(strcmp(s4, "XSYYXsYY") == 0); | |
printf("All tests executed\n"); | |
return 0; | |
} |
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