AI Coding & CSE Fundamentals

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// program to store data dynamically using malloc and extent the existing data using realloc and print it #include<stdio.h> #include<stdlib.h> int main() { int *p,n,i,k; printf("Enter number of elements to be stored:"); scanf("%d",&n); p=(int*)calloc(n,sizeof(int)); if(p==NULL){ printf("Cannot allocate memory"); exit(1); } printf("Enter %d elements:",n); for(i=0;i<n;i++) { scanf("%d",p+i); } printf("The entered elements are:"); for(i=0;i<n;i++){ printf("%4d",*(p+i)); } printf("\nEnter number of elements you want to extend:"); scanf("%d",&k); p=(int*)realloc(p,k*sizeof(int)); if(p==NULL){ printf("Cannot allocate memory"); exit(1); } printf("Enter the next %d elements:",k); for(i=0;i<k;i++) { scanf("%d",(p+n+i)); } printf("The entered elements after extending are:"); for(i=0;i<n+k;i++){ printf("%4d",*(p+i)); } free(p); return 0; } //@c_programming_language_programs

// program to store data dynamically using calloc and print it #include<stdio.h> #include<stdlib.h> int main() { int *p,n,i; printf("Enter number of elements to be stored:"); scanf("%d",&n); p=(int*)calloc(n,sizeof(int)); if(p==NULL){ printf("Cannot allocate memory"); exit(1); } printf("Enter %d elements:",n); for(i=0;i<n;i++) { scanf("%d",p+i); } printf("The entered elements are:"); for(i=0;i<n;i++){ printf("%4d",*(p+i)); } free(p); return 0; } //@c_programming_language_programs

// program to store data dynamically using malloc and print it #include<stdio.h> #include<stdlib.h> int main() { int *p,n,i; printf("Enter number of elements to be stored:"); scanf("%d",&n); p=(int*)malloc(n*sizeof(int)); printf("Enter %d elements:",n); for(i=0;i<n;i++) { scanf("%d",p+i); } printf("The entered elements are:"); for(i=0;i<n;i++){ printf("%4d",*(p+i)); } free(p); return 0; } //@c_programming_language_programs

// program to read a string from the user and convert characters in lower case to upper // and the characters which are in uppercase to lower uaing pointers. #include<stdio.h> void toggleChar(char*); int main() { char str[50]; printf("Enter the string:"); scanf("%[^\n]",str); toggleChar(str); printf("Converted string is: %s",str); return 0; } void toggleChar(char *ptr_ch){ int i; for(i=0;*(ptr_ch+i)!='\0';i++){ if(*(ptr_ch+i)>='A' && *(ptr_ch+i)<='Z'){ *(ptr_ch+i)=*(ptr_ch+i)+32; } else if(*(ptr_ch+i)>='a' && *(ptr_ch+i)<='z'){ *(ptr_ch+i)=*(ptr_ch+i)-32; } } }

// Program to print array elements using pointers #include<stdio.h> void printArray(int*,int); int main() { int a[]={10,20,30,40,50}; printArray(a,sizeof(a)/sizeof(a[0])); return 0; } void printArray(int *ptr_arr,int size){ int i; for(i=0;i<size;i++) { printf("%4d",*(ptr_arr+i)); } } //@c_programming_language_programs

// Program to print sum of three numbers and also find maximum of three void sumAndMax(int ,int ,int ,int*,int*); #include<stdio.h> int main() { int a=50,b=90,c=20,sum,max; sumAndMax(a,b,c,&sum,&max); printf("Sum= %d , Maximum number= %d",sum,max); return 0; } void sumAndMax(int x,int y,int z,int *p,int *q){ *p=x+y+z; *q=(x>y && x>z)?x:(y>z?y:z); // greatest of three numbers using ternary operator } //@c_programming_language_programs

// program to swap two numbers using pointers #include<stdio.h> void swap(int *,int *); int main() { int a=5,b=10; printf("Values of a and b before swapping:\n"); printf("a=%d , b=%d\n",a,b); swap(&a,&b); printf("Values of a and b after swapping:\n"); printf("a=%d , b=%d\n",a,b); return 0; } void swap(int *a,int *b){ int temp; temp=*a; *a=*b; *b=temp; } //@c_programming_language_programs

// program for knowing size of pointer,snd also size of the data type that it is pointing to #include<stdio.h> int main() { int *p; float *q; double *r; char *ch; //size of the pointers printf("Size of pointer p: %lu\n",sizeof(p)); printf("Size of pointer q: %lu\n",sizeof(q)); printf("Size of pointer r: %lu\n",sizeof(r)); printf("Size of pointer ch: %lu\n",sizeof(ch)); //sizes of data types that pointers are pointing printf("Size of int: %lu\n",sizeof(*p)); printf("Size of float: %lu\n",sizeof(*q)); printf("Size of double: %lu\n",sizeof(*r)); printf("Size of char: %lu\n",sizeof(*ch)); return 0; } //@c_programming_language_programs

// Accessing value of a variable using Pointer to pointer #include<stdio.h> int main() { int a=10; int *p,**q; p=&a; q=&p; printf("Value of a :%d",**q); return 0; } //@c_programming_language_programs

// program to increment the value of a variable using pointer #include<stdio.h> int main() { int x=4; int *p; p=&x; printf("Value of X before incrementing:%d\n",x); *p=*p+1; printf("Value of X after incrementing:%d",x); return 0; } //@c_programming_language_programs

// Program to print value of a variable using pointer #include<stdio.h> int main() { int x=5; int *p; p=&x; printf("Value of x :%d",*p); return 0; } //@c_programming_language_programs

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