1寫兩個函數(shù)，分別求兩個整數(shù)的最大公約數(shù)和最小公倍數(shù)，用主函數(shù)調(diào)用這兩個函數(shù),并輸出結(jié)果。這兩個數(shù)由鍵盤輸入。程序設(shè)計：#includevstdio?h>inthcf(intx,inty){intt;if(xvy){t=x;x=y;y=t;}while((t=x%y)!=0){x=y;y=t；}returny;}intlcf(intx,inty,intm){returnx*y/m;}intmain(){inthcf(int,int);intlcf(int,int,int);intx,y,h,l;printf("請輸入兩個數(shù)：")；scanf("%d%d",&x,&y);h=hcf(x,y);l=lcf(x,y,h);printf("最大公約數(shù)為：h=%d\Q最小公倍數(shù)為:l=%d\n",h,l);return0;}運行結(jié)果：ca"C:\DocumentsandSettings\Administra510h=5510h=51=10tocontinuee2求方程axA2+bx+c=0的根，用3個函數(shù)分別求當(dāng)：bA2-4ac大于0、等于0和小于0時的根并輸出結(jié)果。從主函數(shù)輸入a，b，c的值。程序設(shè)計：#includevstdio.h>#include<math.h>voidg_two(doublea,doubleb,doublec){doublex1,x2;x1=(-b+sqrt(b*b-4*a*c))/(2*a);x2=(-b-sqrt(b*b-4*a*c))/(2*a);printf("方程的兩個根為：x1=%f\nx2=%f\n",x1,x2);}voidg_one(doublea,doubleb,doublec){doublex;x=(-b)/(2*a);printf("方程的兩個根為：x1=x2=%f\n",x);}voidg_zone(doublea,doubleb,doublec){printf("無解\n");}voidmain(){voidg_two(double,double,double);voidg_one(double,double,double);voidg_zone(double,double,double);doublea,b,c,t;printf("請輸入a、b、c的值：")；scanf("%lf%lf%lf",&a9&b,&c);t=b*b-4*a*c;if(t>0)g_two(a,b,c);elseif(t==0)g_one(a,b,c);elseg_zone(a,b,c);}運行結(jié)果：嬴"C:\DocurnentsandSettingsXAdministn幘樹入仏b、c的值：12療程的兩個根為：xl=2.000000x2=-4.000000PressanykeytocontinueH""C:\DocumentsandSettings\AdministratorM幘樹入仏b、c的值：121廬■程的兩個根為：Xl=X2=-1.000000Pressanyke^tocontinueHca"C:\DocumentsandSettings\Administrato晴輸入仏h、(:的值：12"?Pressanvkeytocontinue3?寫一個判斷素數(shù)的函數(shù)，在主函數(shù)輸入一個整數(shù)，輸出是否是素數(shù)的信息。程序設(shè)計：#includevstdio?h>#include<math.h>intpri(inta){inti,m=1;f0r(i=2;iv=sqrt((double)a)&&m==1;i++){if(a%i==0)m=0;}returnm;}intmain(){intpri(int);inta;printf("請輸入一個整數(shù):");scanf("%d",&a);if(pri(a))printf("該數(shù)是素數(shù)5");elseprintf("該數(shù)不是素數(shù)5");return0;}運行結(jié)果：~"C:\DocumentsandSettings\Administry贋聖是爨數(shù)：°Pressani/keytocontinueca''C:\DcKurnentsandSettings\Administrator\&13Pressanykeytocontinue4?寫一個函數(shù)，使給定的一個（3X3）二維整形數(shù)組轉(zhuǎn)置，即行列互換。程序設(shè)計：#include<stdio.h>intmain(){voidex(inta[]⑶4nty);intij,a[3]⑶；prinf("請輸入一個3*3二維整形數(shù)組：\n");for(i=0;iv=2;i++)伽(j=0jv=2j++)scanf("%d",&a[i][j]);}ex(a3);prinf("行列互換后的數(shù)組為：\n");for(i=0;i<3;i++){for(j=0jv3j++)printf("%d",a[i][j]);printf("\n");}return0;}voidex(inta[][3]jnty){intij,t;for(i=0;iv3;i++)for(j=ijv3j++){t=a[i][j];a[i]j]=aj][i];a[j][i]=t;}}運行結(jié)果：0123456789行列互換后的數(shù)組為：1475869Pressanykeytocontinue5?寫一函數(shù)，使輸入的一個字符串按反序存放，在主函數(shù)中輸入輸出字符串。程序設(shè)計：#includevstdio.h>#includevstring.h>intmain(){voidinv(charstr[]);charstr[100];prinf("請輸入字符串：\n");scanf("%s",str);inv(str);printf("請輸出反序后的字符串：\n");printf("%s\n",str);return0;}voidinv(charstr[]){chart;intij；for(i=0j=strlen(str);iv(strlen(str))/2;i++j--){t=str[i];str