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C Array

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C Array

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  1. C Array Continue one dimensional array

  2. Passing array to function • Assume we have define this array: inthourlyTemp[ 24 ]; • And we need to insert this array as parameter into function modifyArray( ); • So, we need two parameters one for name of the array without brackets and the other is length of array . • Then the above function look like this: void modifyArray(inthotemp, int e );

  3. Passing array to function • C automatically passes arrays to function by reference [ the called functions can modify the element values in the callers] original arrays. • The name of the array is actually the address of the first element of the array. • Because the starting address of the array is passed, the called function knows precisely where the array is stored. • In the next example we illustrate if we print array, &array and &array[0] are the same if we print the address by using %p.

  4. Passing array to function #include <stdio.h> void main( ) { char array[5]; printf(“\n array = %p \n&array[0]= %p\n&array= %p \n”, array, &array[0], &array); } Output: array= 0012FF78 &array[0]= 0012FF78 &array= 0012FF78

  5. Passing array to function Notes: • Entire array are passed by reference • But individual array elements are passed by value.

  6. Passing array to function /* pass array a to modifyarray by reference*/ modifyArray(a, SIZE); printf(“\nThe values of modifyArray are:\n”); for(i=0; i< SIZE; i++) { printf(“\n%d”, a[i]); } printf(“\nOutput value of a[3] befor calling modifyElement= %d\n”. a[3]); /* pass value a[3] to modifyElement by value*/ modifyElement(a[3]); • printf(“\nOutput value of a[3] after calling modifyElement = %d\n”. a[3]); }// end main #include<stdio.h> #define SIZE 5 void modifyArray(int b[], int size); void modifyElement(int e); void main( ) { int a[SIZE]={0, 1, 2, 3, 4}; inti; printf(“\nThe values of original array are:\n”); for(i=0; i< SIZE; i++) { printf(“\n%d”, a[i]); }

  7. continue void modifyArray(int b[], int size) { int j; for(j=0; j< size; j++) { b[j] *= 2; } } void modifyElement(int e) { printf(“\nOutput value of a[3] in modifyElement= %d\n”. e *= 2); }

  8. Passing array to function #include<stdio.h> void tryToModifyArray( const int b[]); void main( ) { int a[]={10, 20, 30}; tryToModifyArray( a ); printf(“%d %d %d\n”, a[0],a[1], a[2]); }//end main void tryToModifyArray( const int b[]) { b[0] /=2; //error • b[1] /=2; //error • b[2] /=2; //error }

  9. //Buble sort • for(pass=1; pass< SIZE; pass++) { for(i=0; i< SIZE-1; i++) { if( a[i]> a[i+1]) { hold = a[i]; a[i] = a[i+1]; a[i+1] = hold; • } //end if • } //end for i }//end for pass printf(“\nData items in assending order:\n”); for(i=0; i< SIZE; i++) { printf(“\n%d”, a[i]); } • } //end main Sorting array: #include<stdio.h> #define SIZE 10 void main( ) { int a[SIZE]= {2,6,4,8,10,12,89,68,45,37}; int pass, i, hold; printf(“\nthe original data array:\n ”); for(i=0; i< SIZE; i++) { printf(“\n%d”, a[i]); }

  10. Searching array: #include<stdio.h> #define SIZE 100 intLinearSearch(const int array, int key, int size); void main( ) { int a[SIZE]; int x, searchkey, element; for(x=0; x< SIZE; x++) { a[i]=2*x; } printf(“\nEnter integer search key: ”); scanf(“%d”, &searchkey); element = LinearSearch(a, searchkey, SIZE); if(element != -1) printf(“element found in %d”, element); else printf(“\n not found”); }//end main

  11. Continue Searching array: intLinearSearch(const int array, int key, int size) { int n; for(n=0; n< size; ++n) { if( array[n]== key) { return n;} //end if } //end for n return -1; // if key is not found } //end function

  12. ass • Modify searching array program for character التسليم بعد العيد