printf()中的抑制赋值

当转换说明是%d，那么参数列表应该包括和d对应的值（这个技巧也适用于浮点值指定精度和字段宽度）
printf()函数的返回值是，返回打印字符的个数

示例

#include<stdio.h>
#define  ATOM "He's a Trisolaran!"
int main(void){int litho;int width=9;int core=4;double hydro =123.45;printf("%*d\n",core,width);printf("%*.*lf\n",width,core,hydro);litho=printf("%s\n",ATOM);printf("%d characters\n",litho);return 0;
}

scanf()中的抑制赋值

把*放在%和转换字符之间时，会使得scanf()跳过相应的输出项
scanf()函数返回成功读取的项数

示例

#include<stdio.h>
int main(void){int n;scanf("%*d %*d %d",&n);printf("The last character is %d\n",n);  //把*放在%和d之间，会使得scanf跳过相应的输出项return 0;}

在比姓名宽度宽3的字段中打印名字

示例

#include<stdio.h>
#include<string.h>
int main(void){char name[15] ;char surname[15];printf("Please enter your name:\n");scanf("%s %s",name,surname);printf("Yeah!Your name is \"%s,%s\"\n",name,surname);printf("\"%20s\"\n",name);printf("\"%-20s\"\n",name);printf("\"%*s\"",(int)strlen(name)+3,name);//这里int为强制转换，不进行强制转换会出现警告Field width should have type 'int', but argument has type 'unsigned long'return 0;
}