>>727
FILE* fp = fopne("setting.ini", "r");
char line[256];
int A, B, C;

fgets(line, sizeof(line), fp);
sscanf(line, "%d", &A);

fgets(line, sizeof(line), fp);
sscanf(line, "%d", &B);

fgets(line, sizeof(line), fp);
sscanf(line, "%d", &C);

fclose(fp);

ぜんぜんC++じゃないけど。