基本数据类型定义

#include <stdio.h> 
int main() 
{ 
    char a = 'a'; 
    int b = 1;
    float c = 1.2;
    double d = 3.14;
    printf("char:%c\n",a);
    printf("int:%d\n",b);
    printf("float:%f\n",c);
    printf("doule:%lf\n",d);
    return 0; 
}

char:a
int:1
float:1.200000
doule:3.140000