A.
#include void main() { int yy,mm,len; printf(" year,month= " ); scanf( " %d %d " ,yy,mm); switch(mm) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: len=31 ; break; case 4: case 6: case 9: case 11: len=30; break; case 2: if(yy%4==0&&yy%100!=0||yy%400==0) len=29 ; else len=28 ; break; default: printf(" input error " ); break; } printf( " the length of %d %d is %d\n " ,yy,mm,len); }
B.
#include void main() { int yy,mm,len; printf(" year,month= " ); scanf( " %d %d " ,&yy,&mm); switch(mm) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: len=31 ; case 4: case 6: case 9: case 11: len=30; case 2: if(yy%4==0&&yy%100!=0||yy%400==0) len=29 ; else len=28 ; default: printf(" input error " ); } printf( " the length of %d %d is %d\n " ,yy,mm,len); }
C.
#include void main() { int yy,mm,len; printf(" year,month= " ); scanf( " %d %d " ,&yy,&mm); switch(mm) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: len=31 ; break; case 4: case 6: case 9: case 11: len=30; break; case 2: if(yy%4==0&&yy%100!=0&&yy%400==0) len=29 ; else len=28 ; break; default: printf(" input error " ); break; } printf( " the length of %d %d is %d\n " ,yy,mm,len); }
D.
#include void main() { int yy,mm,len; printf(" year,month= " ); scanf( " %d %d " ,&yy,&mm); switch(mm) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: len=31 ; break; case 4: case 6: case 9: case 11: len=30; break; case 2: if(yy%4==0&&yy%100!=0||yy%400==0) len=29 ; break; else len=28 ; break; default: printf(" input error " ); break; } printf( " the length of %d %d is %d\n " ,yy,mm,len); }