5
5.1
5.2 forwhile
5.3 do-while
5.4 breakcontinue
5.5
──
[Return]
5.1
1100
1+2+……+100”
sum0sum += nn12…… 1003
1n1
21 sum += n”n1
3n101sum1100
C3
1for
2do-while
3while
4gotoifgoto1100
main()
{ int n=1,sum=0;
loop,sum += n; n++;
if (n<=100) goto loop;
printf(“sum=%d\n”,sum);
}
loop:”,gotogoto
gotogoto
forwhile
[Return]
5.2 forwhile
3for
[5.1] 1100
/*AL5_1.C*/
/*1100*/
main()
{ int i,sum=0; /*sum0*/
for(i=1; i<=100; i++) sum += i; /**/
printf("sum=%d\n",sum);
} []
sum=5050
[5.2] nn!n!=1*2*……*n
/*AL5_2.C*/
/*n*/
main()
{ int i,n;
long fact=1; /*fact1*/
printf(“Input n:,); scanf(“%d”,&n);
for(i=1; i<=n; i++) fact *= i; /**/
printf("%d ! = %ld\n",n,fact);
} []
Input n,5
5 ! = 120
1for
for([ ][][])
{ }
2for
5-1
1
2 034
3 2
4for
3
1
2
3
for(sum=0;i<=100;i++) sum += i;
for(sum=0,i=1;i<=100;i++) sum += i;
4
4while
1
while( )
{ }
2
5-2
1 023
21
3while
whilefor
[5.3] while1100
/*AL5_3.C*/
/*1100*/
main()
{ int i=1,sum=0; /*isum*/
while( i<=100 )
{ sum += i; /**/
i++; /*i1*/
}
printf(“sum=%d\n”,sum);
} []
sum=5050
5
1
2forwhiledo-while
[Return]
5.3 do-while
1
do
{ ; }
while(); /**/
2
5-3
1
2 013
3do-while
do-while
[5.4] do-while1100
/*AL5_4.C*/
/*1100*/
main()
{ int i=1,sum=0; /**/
do
{ sum += i; /**/
i++;
}
while(i<=100); /*i<=100*/
printf(“sum=%d\n”,sum);
} []
do-while 1do-whilefor
[Return]
5.4 breakcontinue
breakcontinue
1 break
continue
2
1break
2continueforwhiledo-while
3breakcontinue5-4
4
1breakswitchcontinue
2breakcontinue
[Return]
5.5
[5.5] Fibonacci40F1=1F2=1Fn=Fn-1+Fn-2n>=332
212.1
/*AL5_5.C*/
main()
{ long int f1=1,f2=1; /*2*/
int i=1; /*i*/
for( ; i<=20; i++ ) /*122040*/
{ printf(“%15ld%15ld”,f1,f2); /*2*/
if(i%2==0) printf(“\n”); /*24*/
f1 += f2; f2 += f1; /*2*/
}
} []
[5.6] 10100n1n2n-1
1nfor
2n2n-1n
0
main()
{ int i=11,j,counter=0;
for( ; i<=100; i+=2) /*i*/
{ for(j=2; j<=i-1; j++) /*i*/
if(i%j= =0) /*i*/
break; /*if*/
if(counter%10= =0) /*10*/
printf(“\n”);
if( j >= i ) /*i1*/
{ printf(“%6d”,i);
counter++;
}
}
} []
i112
[Return]
──
3
Cforwhiledo...while
1for
/**/
for(;;) /**/
{ …… }
2while
/**/
while( ) /**/
{ …… }
3do...while
/**/
do { …… }
while( ) /**/
[Return]