{"id":6899,"date":"2022-09-05T19:34:06","date_gmt":"2022-09-05T14:04:06","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-what-are-the-values-of-pointers-and-variables-according-to-this-c-code\/"},"modified":"2022-09-05T19:34:06","modified_gmt":"2022-09-05T14:04:06","slug":"solved-what-are-the-values-of-pointers-and-variables-according-to-this-c-code","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-what-are-the-values-of-pointers-and-variables-according-to-this-c-code\/","title":{"rendered":"[Solved] What are the values of pointers and variables according to this C code?"},"content":{"rendered":"

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\n<\/p>\n

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Here’s some code which shows what’s going on (in excruciating detail):<\/p>\n

#include <stdio.h>\n\nint main(void)\n{\n    int a = 11;\n    int b = 20;\n    int x = -1;\n    int y = -1;\n    int *ip1 = &a;\n    int *ip2 = &x;\n    int **ipp = &ip2;\n\n    printf(\"Addresses:\\n\");\n    printf(\"   &a = %p\\n\", (void *)&a);\n    printf(\"   &b = %p\\n\", (void *)&b);\n    printf(\"   &x = %p\\n\", (void *)&x);\n    printf(\"   &y = %p\\n\", (void *)&y);\n    printf(\" &ip1 = %p\\n\", (void *)&ip1);\n    printf(\" &ip2 = %p\\n\", (void *)&ip2);\n    putchar('\\n');\n    printf(\"%3s  %3s  %3s  %3s  %14s  %14s  %14s  %4s  %4s  %5s\\n\",\n           \"a\", \"b\", \"x\", \"y\", \"ip1\", \"ip2\", \"ipp\", \"*ip1\", \"*ip2\", \"**ipp\");\n    printf(\"%3d  %3d  %3d  %3d  %14p  %14p  %14p  %4d  %4d  %5d\\n\",\n           a, b, x, y, (void *)ip1, (void *)ip2, (void *)ipp, *ip1, *ip2, **ipp);\n\n    *ip2 = *ip1 * 7 + b;\n    printf(\"%3d  %3d  %3d  %3d  %14p  %14p  %14p  %4d  %4d  %5d\\n\",\n           a, b, x, y, (void *)ip1, (void *)ip2, (void *)ipp, *ip1, *ip2, **ipp);\n\n    ip1 = ip2;\n    printf(\"%3d  %3d  %3d  %3d  %14p  %14p  %14p  %4d  %4d  %5d\\n\",\n           a, b, x, y, (void *)ip1, (void *)ip2, (void *)ipp, *ip1, *ip2, **ipp);\n\n    ip2 = &y;\n    printf(\"%3d  %3d  %3d  %3d  %14p  %14p  %14p  %4d  %4d  %5d\\n\",\n           a, b, x, y, (void *)ip1, (void *)ip2, (void *)ipp, *ip1, *ip2, **ipp);\n\n    **ipp = 88;\n    printf(\"%3d  %3d  %3d  %3d  %14p  %14p  %14p  %4d  %4d  %5d\\n\",\n           a, b, x, y, (void *)ip1, (void *)ip2, (void *)ipp, *ip1, *ip2, **ipp);\n\n    *ipp = &b;\n    printf(\"%3d  %3d  %3d  %3d  %14p  %14p  %14p  %4d  %4d  %5d\\n\",\n           a, b, x, y, (void *)ip1, (void *)ip2, (void *)ipp, *ip1, *ip2, **ipp);\n\n    return 0;\n}\n<\/code><\/pre>\n
It simply prints the addresses of all the variables except ipp<\/code> \u2014 it’s address is never used by any expression in the code.  It then prints the values of each of the plain integers, each of the pointers, and the various dereferenced pointers.<\/p>\n
Sample output<\/h3>\n
Addresses:\n   &a = 0x7fff5bacd4f0\n   &b = 0x7fff5bacd4f4\n   &x = 0x7fff5bacd4f8\n   &y = 0x7fff5bacd4fc\n &ip1 = 0x7fff5bacd500\n &ip2 = 0x7fff5bacd508\n\n  a    b    x    y             ip1             ip2             ipp  *ip1  *ip2  **ipp\n 11   20   -1   -1  0x7fff5bacd4f0  0x7fff5bacd4f8  0x7fff5bacd508    11    -1     -1\n 11   20   97   -1  0x7fff5bacd4f0  0x7fff5bacd4f8  0x7fff5bacd508    11    97     97\n 11   20   97   -1  0x7fff5bacd4f8  0x7fff5bacd4f8  0x7fff5bacd508    97    97     97\n 11   20   97   -1  0x7fff5bacd4f8  0x7fff5bacd4fc  0x7fff5bacd508    97    -1     -1\n 11   20   97   88  0x7fff5bacd4f8  0x7fff5bacd4fc  0x7fff5bacd508    97    88     88\n 11   20   97   88  0x7fff5bacd4f8  0x7fff5bacd4f4  0x7fff5bacd508    97    20     20\n<\/code><\/pre>\n
Make sure you understand what you see \u2014\u00a0it isn’t hard to connect the dots when all the data is present like that.<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
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solved What are the values of pointers and variables according to this C code? <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Here’s some code which shows what’s going on (in excruciating detail): #include <stdio.h> int main(void) { int a = 11; int b = 20; int x = -1; int y = -1; int *ip1 = &a; int *ip2 = &x; int **ipp = &ip2; printf(“Addresses:\\n”); printf(” &a = %p\\n”, (void *)&a); printf(” &b = … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,712],"class_list":["post-6899","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-pointers"],"yoast_head":"\n[Solved] What are the values of pointers and variables according to this C code? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-what-are-the-values-of-pointers-and-variables-according-to-this-c-code\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] What are the values of pointers and variables according to this C code? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Here’s some code which shows what’s going on (in excruciating detail): #include <stdio.h> int main(void) { int a = 11; int b = 20; int x = -1; int y = -1; int *ip1 = &a; int *ip2 = &x; int **ipp = &ip2; printf("Addresses:n"); printf(" &a = %pn", (void *)&a); printf(" &b = ... 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