C語言通過使用sizeof運算符，可以判斷出包括char型在內的所有數據類型的長度。

#include <stdio.h>int main(void){printf("zizeof(char) = %u\n", (unsigned)sizeof(char));printf("zizeof(short) = %u\n", (unsigned)sizeof(short));printf("zizeof(int) = %u\n", (unsigned)sizeof(int));printf("zizeof(long) = %u\n", (unsigned)sizeof(long));return 0; }

運行結果：

程序的運行結果因編譯器和運行環境的不同而不用。但**sizeof(char)**必定為1。
short、int 和 long具有以下關系。
sizeof(short) ≤ sizeof(int) ≤ sizeof(long)
注：根據編譯器的不同，也可能三者為同樣長度。

#include <stdio.h>int main(void){int int_a, int_b;double double_a, double_b;printf("sizeof(int) = %u\n", (unsigned)sizeof(int));printf("sizeof(double) = %u\n", (unsigned)sizeof(double));printf("sizeof(int) = %u\n", (unsigned)sizeof(int_a));printf("sizeof(double) = %u\n", (unsigned)sizeof(double_a));printf("sizeof(int + int) = %u\n", (unsigned)sizeof(int_a + int_b)); printf("sizeof(int + double) = %u\n", (unsigned)sizeof(int_a + double_b));printf("sizeof(double + double) = %u\n", (unsigned)sizeof(double_a + double_b));return 0; }

運行結果：

總結

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