² C
, Ѳ.
1. Ͳ ²Ҳ
1.1. , , ᒺ FILE. , ,
FILE *lst;
FILE - , stdio.h; lst ;
³ fopen, :
FILE *fopen ( , );
fopen , NULL, . Գ , .
:
w - ; , ;
r - ;
a - , .
+, , , :
FILE *lst;
lst=fopen(D:\TC\file.txt,r+);
D:\TC\file.txt , .
fflush, . :
int fflush (__);
EOF , 0 .
ϳ fclose, :
int fclose(__);
remove. :
int remove(_);
remove, :
int rename(__, __);
remove, rename 0, .
1.2. - fprint fscanf , :
int fprintf (__, , );
int fscanf (__, , );
ᒺ :
- , ;
- , ;
- ( , , .).
% , . ̳ :
- - , , . - ;
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- , . , , float double;
- l, long;
():
d - ;
o - ;
x - ;
c - ( char);
s - (string);
e - ;
f - (float);
g - e f, ;
u - (unsigned);
p - (pointer).
% , .
:
\a - (alarm);
\b - (back);
\n - (new);
\r - ( ) (return);
\t - (tabulation);
\v - (vertical).
1. ³ . 10 10 .
#include <stdio.h>
main()
{int i,j;
FILE *lds;
lds=fopen("epa.txt","w");
/*³ . , */
for(i=1;i<=10;i++)
for(j=1;j<=10;j++)
fprintf(lds,"%d%c",i+j-1,((j==10)?'\n':' '));
/* */
/* , printf*/
fprintf(lds,"\n");
fclose(lds);
/* */
}
1.3. fgetc fputc , :
int fgetc(__);
int fputc(__);
fgetc , , EOF . fputs , , , EOF .
- fgets fputs, , fgetc, fputc.
1.4. - fwrite fread . :
int fread (__, _ᒺ, _ᒺ, __); ᒺ , __, ᒺ _ᒺ, _ᒺ , __. ᒺ. int fwrite(__, _ᒺ, _ᒺ, __); ᒺ , __, ᒺ _ᒺ, _ᒺ , __. ᒺ. 1.5. . fseek, : int fseek(_, , . );
. , . :
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SEEK_SET ;
SEEK_CUR ;
SEEK_END ;
ftell , :
long ftell(__);
2. .
#include <stdio.h>
#include <conio.h>
void main(void)
{
const n=10;
int a[10];
FILE *pfile;
int i,j,pos,start;
int *pstart;
pstart=&start;
/* start */
clrscr();
printf("\nFilling vector with numbers...\n\n a=[ ");
for(i=0;i<10;i++)
{
a[i]=i+1;
printf("%d ",a[i]);
}
printf("]\n\nCreating binary file epa.dat for editing...");
pfile=fopen("epa.dat","w+b");
/* */
j=fwrite(a,sizeof(int),n,pfile);
/* */
if(j<n) printf("\n\nAn error occured. Only %d of %d elements was written",j,n);
else printf("\n\nFile was filled with %d elements successfully",j);
fflush(pfile);
/* */
printf("\n\nEnter the number of element you want to read from bin file ");
scanf("%d",&j);
fseek(pfile,(j-1)*sizeof(int),SEEK_SET);
/* */
pos=ftell(pfile);
/* */
fread(pstart,sizeof(int),1,pfile);
printf("\n\nSEEK_SET: %dth element position is %d, element is %d",j,pos,*pstart);
printf("\n\nPress any key to exit");
getch();
fclose(pfile); /* */
}
2.
"Ѳ", .
2.1. ³ , ' . , . .
2.2. privod.dat, (n<=30). , . .
2.3. ³ , . . , .
2.4. Y=A*sin(B*X) X 0 2 0.01. . temp.txt 2 . , . result.txt.
2.5. Y=+A*sin(B*X+D) X 1 3 0.1. , B, C, D . , . .
2.6. epa.txt, 1010. .
2.7. , ' . .
2.8. , , . 3 , ' . , , .
2.9. , ֳ, . 4 , ' . , , .
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2.10. , . (n<=20). 5 , . . .
3. Ͳ
3.1. - .
3.2. .
3.3. .
3.4. .
3.5. .
3.6. -.
16
ֲ ² Ѳ
- Ѳ.
1. Ͳ ²Ҳ
1.1. , , . . .
_ _(1 1,..., _n _n);
, f, , a b, :
int f(int a, int b);
ҳ , {}. ҳ return, ,
return <>;
1. . .
#include <stdio.h>
#include <string.h>
/* strlen - */
int revers(char s[50]);
/* revers - */
{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;}
return(0);}
int cc(char s[], char sn[]);
/* - */
{int i,k=0;
for(i=0;i<strlen(s);i++)
{if (s[i]>='0'&&s[i]<='9')
sn[k++]=s[i];}
sn[k]='\0';
return(0);
}
main()
{char s[50],sn[50];
puts("\n\nInput string");
/* */
do {scanf("%s",s);
revers(s);
printf("\n%s\n",s);}
while(s[0]=='0');
/* 0 */
cc(s,sn);
printf("\nNumerical symbols in the string are- %s",sn);
}
2. . .
#include <stdio.h>
void display(int num[10]);
{
int i;
for(i=0;i<10;i++) printf("%d",num[i]);
}
int main(void)
{int t[10], i;
for(i=0;i<10;i++) t[i]=i;
display(t);
return 0;
}
, ﳿ . , , .
3. , .
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#include <stdio.h>
void swap(int *a, int *b)
{
int temp;
temp=*a;
*a=*b;
*b=temp;
};
void main(void)
{
int num1, num2;
printf("\n\nEnter two integers ");
scanf("%d %d",&num1,&num2);
swap(&num1,&num2);
printf("Swapped integers are %d %d",num1,num2);
getch();
}
:
void display(int num[])
{int i;
for(i=0;i<10;i++) printf("%d",num[i]);
}
num . , .
:
void display(int *num)
{int i;
for(i=0;i<10;i++) printf("%d",num[i]);
}
main() , . , 0.
1.2. . , . .
4. n!, .
#include <stdio.h>
int factr(int n)
/* */
{int answer;
if (n==1) return 1;
answer=factr(n-1)*n;
return answer;
}
main()
{
int k=5;
printf("\nn!=%d",factr(k));
}
1.3. CI :
int main(int argc, char *argv)
argc , *argv - . , argv[0] , argc>=1. , :
argv[argc]=NULL
TURBO C Run/Arguments.
5. , . .
#include <stdio.h>
#include <conio.h>
int numspace(char *fname)
{
FILE *pfile;
int c,cnt=0;
pfile=fopen(fname,"r");
while((c=getc(pfile))!=EOF)
if(c==' ')cnt++;
close(pfile);
return cnt;
}
void main(int argc, char *argv[])
{
int i;
clrscr();
for(i=1;i<argc;i++)
{
printf("Number of spaces in file %s is %d\n\n",argv[i],numspace(argv[i]));
}
getch();
}
6. , argv .
#include <stdio.h>
#include <conio.h>
int numspace(char *fname)
{
FILE *pfile;
int c,cnt=0;
pfile=fopen(fname,"r");
while((c=getc(pfile))!=EOF)
if(c==' ')cnt++;
close(pfile);
return cnt;
}
void main(int argc, char *argv[])
{
clrscr();
while(argc-->1)
{
argv++;
printf("Number of spaces in file %s is %d\n\n",*argv,numspace(*argv));
}
getch();
}
2.
Ѳ, .
2.1. n Գ F0=F1=0, Fn+2=Fn+1+Fn, n<=10. . .
2.2. AX2+BX+C=0. , B, C .
2.3. , . .
2.4. , . .
2.5. , . .
2.6. , , AX+BY+C=0 . . , B, C .
2.7. . .
2.8. , , B (xb;yb) A (xa;ya) C(xc;yc). .
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2.9. , , D (xd;yd) A (xa;ya), B (xb;yb) C(xc;yc). .
2.10. , , AX+BY+C=0 A1X+B1Y+C1=0. . , .
3. Ͳ
