#include <stdio.h>
int main(){
 int age = 10;
 printf("I am %d years old.\n", age);

 return 0;
} 

include <stdio.h>
int main(int argc, char *argv[])
{
 int age = 100;
 float num = 2.345f;
 double super_num = 56789.4532;
 char initial = 'A';
 char str[] = "str";
 printf("age is %d.\n", age);
 printf("num is %f.\n", num);
 printf("super num is %f.\n", super_num);
 printf("char is %c.\n", initial);
 printf("str is %s.\n", str);
 return 0;
}

#include <stdio.h>
int main(int argc, char *argv[])
{
 int nums[] = {10, 15, 20, 14, 28};
 char name[] = "Cook";
 char full_name[] = {
  'T', 'i', 'm','C','o','o','k','\0'
 };
 printf("The first num is %d, the 2nd %d.\n",areas[0], areas[1]);
 printf("name=\"%s\" and full_name=\"%s\"\n",name, full_name);
 return 0;
}

#include <stdio.h>
int main(int argc, char *argv[])
{
　　　　int nums[4] = {0};
　　　　char name[4] = {'a'};
　　　　printf("nums: %d %d %d %d\n",nums[0], nums[1],nums[2], nums[3]);
　　　　printf("name each: %c %c %c %c\n",name[0], name[1],name[2], name[3]);
　　　　printf("name: %s\n", name);
　　　　return 0;
}

nums: 0 0 0 0
name each: a 
name: a

#include <stdio.h>
int main(){
  printf("The size of short: %ld\n", sizeof(short));
  printf("The size of int: %ld\n", sizeof(int));
  printf("The size of float: %ld\n",sizeof(float));
  printf("The size of double: %ld\n", sizeof(double));
  printf("The size of char: %ld\n", sizeof(char));
}

The size of short: 2
The size of int: 4
The size of float: 4
The size of double: 8
The size of char: 1