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#include <assert.h>
void echange(int *a, int *b){
int t = *a;
*a = *b;
*b = t;
}
void tri(int *a, int *b){
if (*a <= *b) return;
echange(a,b);
}
void tri_3(int *a, int *b, int *c){
tri(a, b);
tri(a, c);
tri(b, c);
}
int main(){
int a = 2, b = 5;
echange(&a, &b);
assert(a == 5);
assert(b == 2);
tri(&a, &b);
assert(a == 2);
assert(b == 5);
int c = 8;
a = 4; b = 2;
tri_3(&a, &b, &c);
assert(a == 2 && b == 4 && c == 8);
a = 2; b = 4; c = 8;
tri_3(&a, &b, &c);
assert(a == 2 && b == 4 && c == 8);
a = 8; b = 4; c = 2;
tri_3(&a, &b, &c);
assert(a == 2 && b == 4 && c == 8);
}
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