100 cases of Classical C language programming: 1-10 Cases

1. There are 1,2、3, 4 digits, how many three digits of different and no repetition numbers can be formed? How much are they? #include<stdio.h>Main () {inti,j,k,n=0; for(i=1;i<5; i++) for(j=1;j<5; j + +) for(k=1;k<5; k++)if(i!=j&&i!=k&&j!=k) {N++;p rintf ("%d%d%d", i,j,k);if(n%6==0) {printf ("\ n");}} printf ("n=%d\n", n);}2. The issue of wage issuance (1, 10w)0.1(10w,20w)0.075(20w,40w)0.05(40w,60w)0.03(60w,100w)0.015(100w,...)0.01#include<stdio.h>Main () {inti;intu=100000;floatC1,C2,C4,C6,C10,C;C1=u*0.1; C2=c1+u*0.075;/*c4=c2+2u*0.05;c6=c4+2u*0.03;c10=c6+4u*0.015;*/printf ("i="); scanf ("%d",&i);if(i<=T) {C=i*0.1;}Else if(i<=2u) {C=c1+ (i-u) *0.075;}Else{C=i*0.03;} printf ("c=%f\n", c);}//run to the false result, if not use U, run rightly. 3. An integer, plus 100 is a complete square number, plus 168 is a complete square number, what is the number? #include<stdio.h>#include<math.h>Main () {inti,x,y; for(i=1;i<100000; i++) {x=SQRT (i+ -); y=SQRT (i+268);if(x*x==i+ -&&y*y==i+268) printf ("%d\n", i);}} //don't know how to ask for it mathematically?4. Enter a certain month of the year, gets the current day of the year? #include<stdio.h>Main () {intd,m,y,sum,leap;printf ("Please input year-month-day\n"); scanf ("%d-%d-%d",&y,&m,&d);Switch(m) { Case 1: sum=0; Break; Case 2: sum= to; Break; Case 3: sum= -; Break; Case 4: sum= -; Break; Case 5: sum= -; Break; Case 6: sum=151; Break; Case 7: sum=181; Break; Case 8: sum=212; Break; Case 9: sum=243; Break; Case Ten: sum=273; Break; Case  One: sum=304; Break; Case  A: sum=334; Break;default:p rintf ("Data Error"); Break;} Sum=sum+D;if(y% -==0|| (y%4==0&&y% -!=0)) Leap=1;ElseLeap=0;if(leap==1&&m>2) Sum++;p rintf ("It is the%dth day.\n", sum);}5. Enter three integers x, y, Z, please put these three numbers from small to large output. #include<stdio.h>Main () {intx,y,z,t;scanf ("%d%d%d",&x,&y,&z);if(x>y) {T=x;x=y;y=t;}if(x>8) {T=x;x=z;z=t;}if(y>z) {T=y;y=z;z=T;} printf ("Small to big:%d%d%d\n", x, Y, z);}6. Withoutput the letter C pattern. #include<stdio.h>Main () {printf ("Hello c-world!\n");p rintf ("****\n");p rintf ("*\n");p rintf ("*\n");p rintf ("****\n");}7. Title: Output Special pattern, please run in C environment, take a look, Very beautiful!#include<stdio.h>Main () {CharA=176;p rintf ("%c\n", a);} //character problems don't understand8.9*9 multiplication table # include<stdio.h>Main () {inti,j,result;printf ("\ n"); for(i=1;i<Ten; i++){ for(j=1;j<Ten; j + +) {result=i*j;printf ("%d*%d=%-3d", I,j,result);/*-3d = left-aligned, 3-bit*/}printf ("\ n");}} //There are many variants of the multiplication table .9. Requires the output of a chess board. #include<stdio.h>Main () {inti,j; for(i=0;i<8; i++){ for(j=0;j<8; j + +){if((i+j)%2==0) printf ("%d%d",2,2);//The answer is:%c%c, 219,219 don't understandElseprintf (" "); }printf ("\ n");}} Ten. Print Stairs # include<stdio.h>Main () {inti,j;printf ("\1\1\n");/*output of two smiley faces*/ for(i=1;i<5; i++){ for(j=1; j<=i;j++) printf ("*");p rintf ("\ n");}} //There are many variants . 

100 cases of Classical C language programming: 1-10 Cases