吴裕雄--天生自然C语言开发： 输入 & 输出

#include <stdio.h>
int main()
{
    int testInteger = 5;
    printf("Number = %d", testInteger);
    return 0;
}

#include <stdio.h>
int main()
{
    float f;
    printf("Enter a number: ");
    // %f 匹配浮点型数据
    scanf("%f",&f);
    printf("Value = %f", f);
    return 0;
}

#include <stdio.h>
 
int main( )
{
   int c;
 
   printf( "Enter a value :");
   c = getchar( );
 
   printf( "
You entered: ");
   putchar( c );
   printf( "
");
   return 0;
}

#include <stdio.h>
 
int main( )
{
   char str[100];
 
   printf( "Enter a value :");
   gets( str );
 
   printf( "
You entered: ");
   puts( str );
   return 0;
}

#include <stdio.h>
int main( ) {
 
   char str[100];
   int i;
 
   printf( "Enter a value :");
   scanf("%s %d", str, &i);
 
   printf( "
You entered: %s %d ", str, i);
   printf("
");
   return 0;
}