155 lines
2.2 KiB
C++
155 lines
2.2 KiB
C++
String operation
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#include<stdio.h>
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#include<conio.h>
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#include<string.h>
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int STRLEN(char*);
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int STRCPY(char*,char*);
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int STRCMP(char*,char*);
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int STRCAT(char*,char*,char*);
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int STRREV(char*);
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void main()
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{
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int c;
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char str[20],str1[10],str2[10],str3[20];
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clrscr();
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re:
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printf("
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Enter choice=>");
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printf("
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1:string len.
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2:string copy
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3:string
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cmp.
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4:string cat.
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5:string rev.");
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printf("
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6:for exit=>");
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scanf("%d",&c);switch(c)
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{
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case 1:
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printf("Enter the string=>");
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scanf("%s",&str1);
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printf("string length=>%d
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",STRLEN(str1));
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break;
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case 2:
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printf("
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Enter the string=>");
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scanf("%s",str1);
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STRCPY(str2,str1);
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printf("copied string=>");
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puts(str2);
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break;
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case 3:
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printf("Enter two string=>");
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scanf("%s",&str1);
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scanf("%s",&str2);
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if(STRCMP(str2,str1))
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printf("string is equal");
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else
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printf("String is not equal");
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break;
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case 4:
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printf("Enter two string=>");
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scanf("%s",str1);
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scanf("%s",str2);
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STRCAT(str3,str2,str1);
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puts(str3);
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break;
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case 5:
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printf("Enter the string=>");
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scanf("%s",str1);
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STRREV(str1);
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printf("Reverse stringis=>");
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puts(str1);
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break;
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default:
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goto end;
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}
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goto re;
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end:
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getch();
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}
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int STRLEN(char *s)
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{
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int i=0;
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while(*s!=NULL)
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{
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i++;
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s++;
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}
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return i;
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}
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int STRCPY(char *s2,char *s1)
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{
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while(*s1!=NULL)
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{
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*s2=*s1;
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s2++;
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s1++;
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}
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*s2=NULL;
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return 1;
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}
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int STRCMP(char *s2,char *s1)
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{
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int i=0,len1,len2;
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len1=strlen(s1);
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len2=strlen(s2);
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if(len1==len2)
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{
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while(*s2==*s1 && *s2 != NULL && *s1!=NULL)
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{
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i++;
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s1++;
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s2++;
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}
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if(i==len1)
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return 1;
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else
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return 0;
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}
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else
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{
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return 0;
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}
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}
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int STRREV(char *s)
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{
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int len;
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char *s1;
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char *ptr;
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len=strlen(s);
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s1=(char *)malloc(sizeof(char));
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strcpy(s1,s);
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ptr=s1+len-1;
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while(*s!=NULL)
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{
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*s=*ptr;
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ptr--;
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s++;
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s1++;
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}
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*s=NULL;
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return 1;
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}
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int STRCAT(char *s3,char *s2,char *s1)
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{
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while(*s1!=NULL)
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{
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*s3=*s1;
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s3++;
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s1++;
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}
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s3++;
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while(*s2!=NULL)
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{
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*s3=*s2;
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s3++;
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s2++;
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}
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*s3=NULL;
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return 1;
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}
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