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What is anti-dependence?
Statement S2 is anti-dependent on statement S1 if S2 follows S1 in program order and if the output of S2 overlaps the input of S1. The anti-dependence S1 to S2 define as cross arrow such as S1 |-> S2.
What are 4 string handling function?
strlen(s1) to find the length of the string s1 strcpy(s1,s2) copy source string to destination string(i.e copies s2 to s1,s2 remain unchanged) strcmp(s1,s2) compares s1 and s2 and prints 0 if s1 and s2 are equal,-1 if s2 is greater, 1 if s1 is greater strcat(s1,s2) combines string s1 and s2 to a single word and stores it in s1 strupr() converts lower case string to upper case strlwr() converts upper case string to lower case
Write a function for concatnating the string s1 s2 and storing the result in string s3?
char *strmerge (char *s3, const char *s1, const char *s2) { strcpy (s3, s1); strcat (s3, s2); return s3; }
Code to implement memcpy in c?
unsigned char * memcpy(unsigned char * s1, unsigned char * s2, long size) { long ix; s1= (char *)malloc(sizeof(strlen(s2))); for(ix=0; ix < size; ix++) s1[ix] = s2[ix]; return s1; }
How would you write a user defined function to compare two strings without using the library function?
/* ellipses, ..., used to emulate indentation */ int strcmp (const char* s1, const char* s2) { ... while (s1 != NULL && s2 != NULL) { /* scan both strings */ ... ... if (*s1 < *s2) return -1; /* first string less */ ... ... if (*s1 > *s2) return 1; /* first string greater */ ... ... s1++; ... ... s2++; ... } ... if (s1 == s2) return 0; /* strings equal or both empty */ ... if (s1 != NULL) return 1 else return -1; /* first string longer(1) / shorter(-1) */ } A slightly less computation-intensive version is: int strcmp(const char* s1, const char* s2) { ... if (s1==s2) ... ... return 0; ... while (*s1) ... ... if (*s1++^*s2++) ... ... ... if (--s1<--s2) ... ... ... ... return -1; ... ... ... else ... ... ... ... return 1; ... return 0; }
