Printf correlation of C

When output is 41 Of ascii code ’ ）', ‘\41’ For octal 41, Corresponding decimal system 33,33 Of ascii Code for ’ ! '.

	printf("%c%c%c\n", 'H', 41, '\41');
	// Output is : H)!

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stay scanf Function , added ＇ *＇ The part of will be ignored （ skip ）, That is, the data you enter will not be obtained by the corresponding parameters .

stay printf Function ＇*＇ Indicates that the following parameters are used to replace ＇ *＇ The location of , So as to achieve the effect of using variables to control the output format .

int a=1,b=2,c=3,d=5;
printf("%*d\n",a,d);    // Output is 5; Equate to printf("%1d\n",d);
printf("%*d\n",b,d);    // Output is  5; Equate to printf("%2d\n",d);
printf("%*d\n",c,d);    // Output is  5; Equate to printf("%3d\n",d);// Proportion of output  3 Column , Insufficient space filling 

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Control format output

printf("%3.7s",b);      // Indicates that the output length is not less than 3 No more than 7 String