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Pointers and Arrays - Interaction
Arrays example from a Well House Consultants training course
More on Arrays [link]
Source code: afp.c Module: C205
#include <stdio.h>
#ifndef TOP #define TOP 6 #endif /* Multiple variables of the same type, held under the same name and referenced by a position within the set (an index number) are known as arrays. They may be set up using the [] notation in a declaration, or using function calls such as malloc, calloc and realloc (those functions not illustrated in this example. Note a) Once an array is set up, its elements can be accessed using the [] or * (pointer) notation. Note b) An array referred to just by name, even if set up using the [] notation, means "the address of the first element" */ int summer(int * throws,int numthrows) { int sofar=0; int i; // See note a): for (i=0; i<numthrows; i++) sofar += throws[i]; for (i=0; i<numthrows; i++) sofar += *(throws+i); return sofar; } main () { int i; int history[TOP]; // int* history; No good - does not allocate memory! int what; int all; int given = 0; for (i=0; i<TOP; i++) { printf("Throw %d: ",i+1); scanf("%d",&what); printf("Value was %d\n",what); history[given++] = what; } // Here I want to print out all the values again for (i=0; i<TOP; i++) { printf("You gave me a %d the %dth time\n",history[i],i+1); } // See note b) all = summer(&history[0],given); printf("All is %d\n",all); all = summer(history,given); printf("All is %d\n",all); } /* Sample Output munchkin:cj grahamellis$ gcc -o afp afp.c munchkin:cj grahamellis$ ./afp Throw 1: 5 Value was 5 Throw 2: 4 Value was 4 Throw 3: 6 Value was 6 Throw 4: 3 Value was 3 Throw 5: 2 Value was 2 Throw 6: 3 Value was 3 You gave me a 5 the 1th time You gave me a 4 the 2th time You gave me a 6 the 3th time You gave me a 3 the 4th time You gave me a 2 the 5th time You gave me a 3 the 6th time All is 46 All is 46 munchkin:cj grahamellis$ */ Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in C * Learning to program in C and C++ * Programming in C * C and C++ Programming * Learning to program in C and C++ * C and C++ Programming Also available on on site courses for larger groups Books covering this topic
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other closely related examples on the "Arrays" module index page.
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