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@emasaka
Created October 24, 2022 08:46
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#include <stdio.h>
int _add(int a, int b){ return a+b; }
int _sub(int a, int b){ return a-b; }
int _mul(int a, int b){ return a*b; }
int _div(int a, int b){ return a/b; }
struct { char c; int (*f)(int, int); } ops[] =
{ {'+', _add}, {'-', _sub}, {'*', _mul}, {'/', _div}};
int main()
{
for(int i0 =0; i0 < 4; i0++) {
for(int i1 =0; i1 < 4; i1++) {
for(int i2 =0; i2 < 4; i2++) {
for(int i3 =0; i3 < 4; i3++) {
printf("6%c4%c5%c2%c1=", ops[i0].c, ops[i1].c, ops[i2].c, ops[i3].c);
printf("%d\n", ops[i3].f(ops[i2].f(ops[i1].f(ops[i0].f(6, 4), 5), 2), 1));
}
}
}
}
}
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