例 m.n 例inta=1234: float f=123.456; char ch=-‘a'; printf8d,%2d n"a,a); printf"9f%8f%8.1f%.2f%.2eln"fffff): printf(%3cln”,ch)g 运行 1234,1234 结果： 123.456000,123.456000, 123.5,123.46,1.23e+02 a static char a[]="Hello,world!" printf("%sn%15s\n%10.5s\n%2.5s\n%.3s n",a,a,a,a,a); 运行结果：Hello,.world Hello,world! Hello Hello Hel 例 int a=1234; float f=123.456; char ch=‘a’; printf(“%8d,%2d\n”,a,a); printf(“%f,%8f,%8.1f,%.2f,%.2e\n”,f,f,f,f,f); printf(“%3c\n”,ch); 运行 1234,1234 结果： 123.456000,123.456000, 123.5,123.46,1.23e+02 a 例 static char a[]=“Hello,world!” printf(“%s\n%15s\n%10.5s\n%2.5s\n%.3s\n”,a,a,a,a,a); 运行结果：Hello,world! Hello,world! Hello Hello Hel 例 m.n