>>924,>>925をまとめるとこんな感じ

uint32_t number_70;
uint8_t number_66, number_67, number_68, number_69;

number_66 = 255;
number_67 = 255;
number_68 = 255;
number_69 = 1;

number_70 = (uint32_t)number_66 + ((uint32_t)number_67 << 8) + ((uint32_t)number_68 << 16) + ((uint32_t)number_69 << 24);

printf("number_70 = %ld\n", number_70);