已知C源程序如下:
/*分数运算 fsys.c*/
#include<stdio.h>
int main( )
long int a,b,c,d,i,x,y,z;
char op;
printf("两分数b/a,d/c作+、-、*、/四则运算。结果为分数。/n");
printf("请输入分数运算式:b/a op d/c/n");
scanf("%ld/%ld%c%ld%ld",&b,&a,&op,&d,&C) ;
if(a==0||c==0)
printf("分母为0,输入错误!/n");
return(0);
if(op==’+’)
y=b*c+d*a;
x=a*c; /*运算结果均为y/x*/
if(op==’-’)
y=b*c-d*a;
x=a*c;
if(op==’*’)
y=b*d;
x=a*c;
if(op==’/’)
y=b*c;
x=a*d;
z=x;
if(x>y)z=y;
i=z;
while(i>1)
if(x%i==0&&y%i==0)x=x/i;y=y/i;continue;;
i——;
printf("%ld/%ld%c%ld/%ld=%ld/%ld./n",b,a,op,d,c,y,x);
return 0;
已知C源程序如下:
#include
论述题3: 已知C源程序如下: /*longIntAdd*/ #include<stdio.h> #include<string.h> #define LENGTH 81 void addLInt(char s1[],char s2[]); void reverse(char s[]); int main( ) { char intstr1[LENGTH],intstr2[LENGTH]; printf("请输入超长整数的被加数和加数:/n"); scanf("%s%s",intstr1,intstr2); addLInt(intstr1,intstr2); printf("超长整数和为:%s",intstr1); return 0; } void addLInt(char s1[],char s2[]) { int i=0,tmp,c=0; char s[LENGTH]; if(strlen(s1)<strlen(s2)){ strcpy(s,s1); strcpy(s1,s2); strcpy(s2,s); } reverse(s1);reverse(s2); while(s2[i]!=;/0’){ tmp=s1[i]-’0’+s2[i]-’0’+c; 81[i]=tmp%10+’0’; c=tmp/10; i++; } while(si[1]!=’/0’&&c){ tmp=s1[i]-’0’+c; s1[i]=tmp%10+’0’; c=tmp/10; i++; } If(c){ s1[i++]=c+’0’; s1[i]=’/0’; } reverse(s1); } void reverse(char s[]) { int i,j,c; for(i=0,j=strlen(s)-1;i<j;i++,j--){ c=s[i]; s[i]=s[j]; s[j]=c; } }
画出程序中函数addLInt的控制流程图;
已知检查括号匹配及注释、字符串处理的C源程序如下:
#include<stdio.h>
int brace,brack,paren;
void in_quote(int c);
void in_comment(void);
void search(int c);
/*rudimentary syntax checKer for C program*/
int main( )
int c;
extern int brace,brack,paren;
while((c=getchar( ))!=EOF)
if(c==’/’)
if((c=getchar( ))==’*’)
in_comment( ); /*inside comment*/
else
search(C) ;
else if(c==’/"||c=="")
in_quote(c); /*inside quote*/
else
search(c);
if(brace<0) /*output errors*/
printf("Unbalanced braces/n");
brace=0;
else if(brack<0)
printf("Unbalanced brackets/n");
brack=0;
else if(paren<0)
printf("Unbalanced parentheses/n");
paren=0;
if(brace>0) /*output errors*/
已知检查括号匹配及注释、字符串处理的C源程序如下: #include<stdio.h> int brace,brack,paren; void in_quote(int c); void in_comment(void); void search(int c); /*rudimentary syntax checKer for C program*/ int main( ) { int c; extern int brace,brack,paren; while((c=getchar( ))!=EOF){ if(c==’/’){ if((c=getchar( ))==’*’) in_comment( ); /*inside comment*/ else search(C) ; }else if(c==’/"||c=="") in_quote(c); /*inside quote*/ else search(c); if(brace<0){ /*output errors*/ printf("Unbalanced braces/n"); brace=0; }else if(brack<0){ printf("Unbalanced brackets/n"); brack=0; }else if(paren<0){ printf("Unbalanced parentheses/n"); paren=0; } } if(brace>0) /*output errors*/ printf("Unbalanced braces/n"); if(brack>0) printf("Unbalanced brackets/n"); if(paren>0) printf("Unbalanced parentheses/n"); return 0; } /*search:search for rudimentary syntax errors*/ void search(int c) { extern int brace,brack,paren; if(c==&rsqu
温度(℃) | 0 | 10 | 20 | 30 | 40 |
溶解度(克) | 13.3 | 20.9 | 31.6 | 45.8 | 63.9 |
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