整數的輸入輸出

兩種形式輸出：（以int為界）

1. char、short、int都用 %d
2. long 和long long都用 %ld

• %d char、short、int
• %ld long long long
• %u unsignde
• %lu unsignde long long
  整數的格式化輸出示例

#include <stdio.h>
int main(){char a = -1;int b = -1;printf("char a = %d\n int b = %d\n",a,b);
}

輸出為：char a = -1
int b = -1
當以%u輸出時，結果就時umsignde int所能表示的最大數

#include <stdio.h>
int main(){char a = -1;int b = -1;printf("char a = %u\n int b = %u\n",a,b);
}

輸出為：char a = 4294967295
int b = 4294967295

8進制和16進制

#include <stdio.h>
int main(){int a = 012; //字面量以0開頭為8進制char b = 0x12;  //字面量以0x開頭為16進制printf("a=%d,b=%d",a,b);    //以十進制輸出}

輸出為：a=10,b=18