中國(guó)石油大學(xué)c答案

1、1. #include<stdio.h>2. main()3. 4. int x,y;5. scanf( "%d" ,&x);6. if (x<6)7. y=x-12;8. printf( "%dn" ,y);9. if (x>=6&&x<15)10. y=3*x-1;11. printf( "%dn" ,y);12. if (x>=15)13. y=5*x+9;14. printf( "%dn" ,y);15. 4.21. 4.3#include<

2、stdio.h>2. main()3. int a,b,c,d,e,f;4. scanf( "%d" ,&a);5. if (a>0&&a/10<1)6. printf( "1n%dn" ,a);7. else if (a/10>1&&a/10<10)8. b=a/10;9. c=a-b*10;10. printf( "2n%d%dn" ,c,b);11. else if (a/10>10&&a/10<100)12. b=a/100;13

3、. c=(a-b*100)/10;14. d=a-b*100-c*10;15. printf( "3n%d%d%dn" ,d,c,b);16. else if (a/10>=100&&a/10<1000)17. b=a/1000;18. c=(a-b*1000)/100;19. d=(a-b*1000-c*100)/10;20. e=a-b*1000-c*100-d*10;21. printf( "4n%d%d%d%dn" ,e,d,c,b);22. else if (a/10>1000&&a/10<

4、;10000)23. b=a/10000;c=(a-b*10000)/1000;d=(a-b*10000-c*1000)/ 100;24. e=(a-b*10000-c*1000-d*100)/10;f=a-b*10000-c*1000-d* 100-e*10;25. printf( "5n%d%d%d%d%dn" ,f,e,d,c,b);26. else printf( "Invalid inputn" );27. 28. 4.4#include<stdio.h>29. main()30. 31. int a,b,c,d,e;32. sca

5、nf( "%d" ,&a);33. if (a/1000>=10|a/1000<1)34. printf( "Invalid datan" );35. else 36. b=a/1000;c=(a-b*1000)/100;d=(a-b*1000-c*100)/1037. e=a-b*1000-c*100-d*10;38. if (b+c+d+e)%2=0)39. printf("Yesn" );40. else41. printf("Non" );42. 43. 44.45.46.47.48.4

6、9.50.51.52.53.54.55.56.57.58.59.60.4.5#include<stdio.h>main() int a,b,c;scanf( "%d%d%d" ,&a,&b,&c);if (a+b<=c|a+c<=b|b+c<=a)printf( "non-triangle.n" );else if (a=b&&b=c)printf("equilateral triangle.n");else if (a=b&&b!=c|a=c&am

7、p;&c!=b|b=c&&c!=a) printf( "isoceles triangle.n" );elseprintf( "triangle.n" );61. 4.7#include<stdio.h>62. main()63. 64. float l,w,h,m,f;65. scanf( "%f,%f,%f,%f" ,&l,&w,&h,&m);66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.8

8、6.87.88.89.90.91.92.93.94.95.96.97.98.99.100.101.102.103.104.105.106.107.if (l>1|w>1|h>1|m>=30)printf( "Errorn" ); else if (m<10) f=0.2+0.8*m;printf( "%.2fn" ,f); else if (m>=10&&m<20) f=0.2+0.75*m;printf( "%.2fn" ,f); elsef=0.2+0.7*m;printf

9、( "%.2fn" ,f); 4.8#include<stdio.h>main()int a,b,m;scanf( "%d%d" ,&a,&b);if (a=b&&a<50)m=a*90;printf( "%dn" ,m);if (a=b&&a>50)m=a*80;printf( "%dn" ,m);if (a>b&&b<50) m=b*90+(a-b)*60; printf( "%dn" ,m)

10、;if (a>b&&b>50) m=b*80+(a-b)*60;printf( "%dn" ,m);if (a<b&&a<50) m=a*90+(b-a)*45;printf( "%dn" ,m);if (a<b&&a>50) m=a*80+(b-a)*45;printf( "%dn" ,m);4.9#include<stdio.h>main()int a;scanf( "%d" ,&a);if (a>7)

11、108.printf("Errorn" );109.else if(a=1)110.printf("Mondayn" );111.else if(a=2)112.printf("Tuesdayn" );113.else if(a=3)114.printf("Wednesdayn" );115.else if(a=4)116.printf("Thursdayn" );117.else if(a=5)118.printf("Fridayn" );119.else if(a=6)1

12、20.printf("Saturdayn" );121.else if(a=7)122.printf("Sundayn" );123.124.4.10#include <stdio.h>125.main()126.127.char ch=getchar();128.if (ch>= 'A' &&ch<= 'Z' )129.printf("capital lettersn" );130.elseif (ch>= 'a' &&ch<= 'z