C语言程序设计试题集及其答案

9. #include void main() { int sum=0,n; scanf(\ while(n<=5) { sum+=n; n++; } printf(\ }

输入：1<回车>

10. #include void main() { int i, j; for(i=2;i>=0;i--) { for(j=1;j<=i;j++) printf(\ for(j=0;j<=2-i;j++) printf(\ printf(\ } }

11. #include void main() { int a,b; for(a=1,b=1;a<=100;a++) { if(b>20) break; if(b%4==1) b=b+4; } b=b-5; } printf(\ }

12. #include void main( )

{ continue; {

char k; int i;

for(i=1;i<3;i++) {

scanf(\ switch(k) {

case '0': printf(\ case '1': printf(\ } } }

输入：01<回车>

13. #include int main() { int i, s = 0; for(i = 1; i < 10; i++) { s += i * i; if(s > 10) break; } printf(\ return 0; }

14. #include void main() { char ch; while((ch=getchar())!='\\n') { if (ch>='A'&&ch<='Z') ch=ch+32; else if (ch>='a'&&ch<='z') ch=ch-32; printf(\ } } 输入：ABCdef<回车>

15. #include int main () { int a, b; for (a = 1, b = 1 ; a <= 100 ; a++)

{ if (b >= 9) break; if (b % 3 == 1) { b += 3 ; continue ; } b -= 5; } printf(\ return 0; }

16. #include int main () { int i = 0,j = 0; while (i < 10) i++; while (j++ < 10) ; printf(\ return 0; }

17. #include \ void main( ) { int i,j,t; for(i=1,j=10;i<3;i++,j--) t=i+j; t++; printf(\ }

18. #include \ void main() { int i=10,j; do { j = i%2; printf( \ i--; } while ( i> 4 ); }

19. #include \ void main() { int i=7,j; while ( i> 2) {

j = i%2; printf( \ i--; } printf( \ }

20. #include void main() { int i,j,t=0; for(i=3;i>0;i--) for(j=0;j<4;j++) t+=j; printf(\ }

解答: 1. 4321 2. 1 4 9 16

3. i=6,s=9 4. 1 2 3 4 5

5. sum=18

6. * ** *** **** 7. ## #### ###### ########