/* Project Name : Own String Related Functions Project Objective : Only Practice of Pointer with Character Author : Jha Madhavkumar Rajeev Pinkudevi Starting Date of Project : 17 June 2018 Ending Date of Project : xx xxxx 2018 */ // include Header Files Here =============================================================================== #include #include #include // Declare User Defined Function Here ============================================================================ void Heading(char*); void ShowMenu(void); void StringLength(void); void ReverseString(void); void UpperCaseString(void); void LowerCaseString(void); void StringType(void); void StringCopy(void); void StringConcatinat(void); void SaveString(char*); void ShowHistory(void); int my_strlen(char*); char* my_strrev(char*); char* my_strupr(char*); char* my_strlwr(char*); int my_strtype(char*); char* my_strcpy(char*,char*); char* my_strcat(char*,char*); // Define Main Function Here ===================================================================================== int main() { char a; while(1) { system("cls"); ShowMenu(); scanf("%c",&a); fflush(stdin); if(a=='0') exit(0); else if(a=='1') { StringLength(); } else if(a=='2') { ReverseString(); } else if(a=='3') { UpperCaseString(); } else if(a=='4') { LowerCaseString(); } else if(a=='5') { StringType(); } else if(a=='6') { StringCopy(); } else if(a=='7') { StringConcatinat(); } else if(a=='H') { ShowHistory(); } else printf("\n\tInvalid Option."); } return(0); } // Define User Defined Functions that Handls "Output Screens Format,Menus and Other Functions" ================================== void Heading(char *p) { int i,z; printf("\n"); for(z=0;z<=100;z++) printf("="); printf("\n"); for(i=0;*(p+i)!='\0';i++); for(z=0;z<(101-i)/2;z++) printf(" "); puts(p); for(z=0;z<=100;z++) printf("="); printf("\n"); } void ShowMenu(void) { int i; Heading("String Related Functions"); printf("\n\t1. Find Length of String"); printf("\n\t2. Reverse String"); printf("\n\t3. Upper Case String"); printf("\n\t4. Lower Case String"); printf("\n\t5. Check String Type"); printf("\n\t6. Copy String"); printf("\n\t7. Concatinat String"); printf("\n\t0. Exit"); printf("\n\n"); for(i=0;i<=100;i++) printf("="); printf("\n\n\tEnter Your Choice : "); } void SaveString(char *p) { FILE *fp; fp=fopen("String.dat","ab"); fwrite(p,100,1,fp); fclose(fp); } void StringLength(void) { char a[100]; system("cls"); printf("Enter a String:"); gets(&a[0]); SaveString(a); printf("\n\tLength of Entered String is %d",my_strlen(a)); getch(); } void ReverseString(void) { char a[100]; system("cls"); printf("Enter a String:"); gets(&a[0]); SaveString(a); printf("\n\tReverse of String is \"%s\"",my_strrev(&a[0])); getch(); } void UpperCaseString(void) { char a[100]; system("cls"); printf("Enter a String:"); gets(a); SaveString(a); printf("\n\tUpperCase of String is \"%s\"",my_strupr(a)); getch(); } void LowerCaseString(void) { char a[100]; system("cls"); printf("Enter a String:"); gets(a); SaveString(a); printf("\n\tLowerCase of String i \"%s\"",my_strlwr(a)); getch(); } void StringType(void) { char a[100]; int type; system("cls"); printf("Enter a String:"); gets(a); SaveString(a); type=my_strtype(a); if(type==1) printf("\n\tString consist only Small Case Letters"); else if(type==2) printf("\n\tString consist only Capital Case Letters"); else if(type==3) printf("\n\tString consist only Numbers"); else if(type==4) printf("\n\tString consist only Special Symbols"); else if(type==5) printf("\n\tString consist both Small and Capital Case Letters"); else if(type==6) printf("\n\tString consist Small Case Letters and Numbers"); else if(type==7) printf("\n\tString consist Small Case Letters and Special Symbols"); else if(type==8) printf("\n\tString consist Capital Case Letters and Numbers"); else if(type==9) printf("\n\tString consist Capital Case Letters and Special Symbols"); else if(type==10) printf("\n\tString consist Numbers and Special Symbols"); else if(type==11) printf("\n\tString consist Small Case Letters, Capital Case Letters and Numbers"); else if(type==12) printf("\n\tString consist Small Case Letters, Capital Case Letters and Special Sysbols"); else if(type==13) printf("\n\tString consist Small Case Letters, Numbers and Special Symbols"); else if(type==14) printf("\n\tString consist Capital Case Letters, Numbers and Special Symbols"); else if(type==15) printf("\n\tString consist Small Case Letters, Capital Case Letters, Numbers, Special Symbols"); getch(); } void StringCopy(void) { char a[100],b[100]; system("cls"); printf("Enter a String:"); gets(a); SaveString(a); my_strcpy(b,a); printf("\n\tString in Source is \"%s\" \n\tString in Destination is \"%s\"",a,b); getch(); } void StringConcatinat(void) { char a[100],b[100]; system("cls"); printf("Enter First String:"); gets(a); SaveString(a); printf("Enter Second String:"); gets(b); SaveString(b); printf("\n\tFirst String after Concatination is \"%s\"",my_strcat(a,b)); getch(); } void ShowHistory(void) { FILE *fp; char a[100]; int i; system("cls"); fp=fopen("String.dat","rb"); for(i=0;fread(&a,sizeof(a),1,fp)==1;i++) printf("\n\t%s",a); getch(); } // Define User Defined Functions that "are String Related Functions" =============================================================== int my_strlen(char *p) { int i; for(i=0;*(p+i)!='\0';i++); return(i); } char* my_strrev(char *p) { int len,i; char c; for(len=0;*(p+len)!='\0';len++); for(i=0;i=97 && *(p+i)<=122) *(p+i)-=32; return(p); } char* my_strlwr(char *p) { int i; for(i=0;*(p+i)!='\0';i++) if(*(p+i)>=65 && *(p+i)<=90) *(p+i)+=32; return(p); } int my_strtype(char *p) { int i,s=0,c=0,n=0,o=0; for(i=0;*(p+i)!='\0';i++) { if(*(p+i)>=65 && *(p+i)<=90) c=65; else if(*(p+i)>=97 && *(p+i)<=122) s=97; else if(*(p+i)>=48 && *(p+i)<=57) n=48; else if(*(p+i)>=32) o=32; if(s && c && n && o) break; } if(s==97 && c==0 && n==0 && o==0) return(1); else if(s==0 && c==65 && n==0 && o==0) return(2); else if(s==0 && c==0 && n==48 && o==0) return(3); else if(s==0 && c==0 && n==0 && o==32) return(4); else if(s==97 && c==65 && n==0 && o==0) return(5); else if(s==97 && c==0 && n==48 && o==0) return(6); else if(s==97 && c==0 && n==0 && o==32) return(7); else if(s==0 && c==65 && n==48 && o==0) return(8); else if(s==0 && c==65 && n==0 && o==32) return(9); else if(s==0 && c==0 && n==48 && o==32) return(10); else if(s==97 && c==65 && n==48 && o==0) return(11); else if(s==97 && c==65 && n==0 && o==32) return(12); else if(s==97 && c==0 && n==48 && o==32) return(13); else if(s==0 && c==65 && n==48 && o==32) return(14); else if(s==97 && c==65 && n==48 && o==32) return(15); else return(0); } char* my_strcpy(char *p,char *q) { int i; for(i=0;*(q+i)!='\0';i++) *(p+i)=*(q+i); *(p+i)='\0'; return(p); } char* my_strcat(char *p,char *q) { int i,j; for(i=0;*(p+i)!='\0';i++); for(j=0;*(q+j)!='\0';j++) *(p+i+j)=*(q+j); *(p+i+j)='\0'; return(p); }

All String Functions in C++